Add to the 47391 or any other cooler with 5/16" - 3/8" line. https://www.dieselworldmag.com/.../transmission-cooler-bypass-valve The "floating" characteristic of the valve member 46 not only protects the valve components against damage from overextension of the pin 62, but also prevents excessive pressure drops across the flange 50 which might otherwise be caused by incorrect connection of the lines 14, 16, 20 and 22 to the bypass valve 10. The finished, installed product looks like this. Use of this site constitutes acceptance of our user agreement and privacy policy. I have been reading some excellent posts on transmission coolers. Installs in cooler line. Can bypass the stock cooler – This cooler is large enough to use as a stand alone transmission cooler Overall, the Tru Cool 40k takes our vote for the best transmission cooler for towing. As one of the premier Allison builders in the Midwest, LinCo Diesel Performance noticed the problem shortly after the L5P was released. The bypass valve in the link operates at 165*, which I could live with. The comparison view from the outlet side tells a similar story. The present invention relates to oil cooler bypass valve actuating means, and more particularly to actuating means of the type utilizing a thermally responsive element to effect valve actuation. 2, which exists at an oil temperature of approximately 180° F., the flange 50 is seated upon the valve seat 44. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the express prior written permission of Engaged Media. My 04 Ody and I drive in Arizona (temp today 115F). A Simple Fix for a Potentially Fatal Problem. All of the ports 34, 36, 38 and 40 are in communication with the valve chamber 43, the ports 34 and 38 being aligned and oppositely located and opening into the smaller diameter portion of the chamber 42. This type of modulation makes it possible to more precisely control the degree of oil cooling. When the engine oil temperature exceeds 160° F. at least a portion of the oil is directed by the valve 10 to the cooler 18 by means of the line 20. 5. Breaking Point: How Much Can Your Duramax Handle? Which is a great idea in theory. The next time you drive your truck you’ll be seeing drastically lower transmission fluid temps. The factory bypass cooler valve is located under the air intake assembly. 2 toward a location remote from the valve seat 44. Oil Cooler Bypass Valve • For high-performance and Bowtie Big-Blocks with 4-bolt main bearing caps • Must be installed in the rear hole behind the oil filter adapter bolt to route oil through the cooler. FIG. At the end of the test loop, the Allison was running a cool 107 degrees—a 49-degree drop from where we were with the stock bypass valve in the equation. An extensible element or pin 62 is movable in and out of the thermostat body portion 58 and its free end is received within a blind bore 64 provided in the housing cap 28. Allison 1000 L5P Transmission Cooler Thermostatic Bypass Upgrade All 2017+ L5P Duramax equipped GM/Chevy trucks have always been known to run hotter than then their early predecessors. It acts like a thermostat, staying closed until the temp reaches approx 190 degrees, then opening to allow fluid to flow through the cooler. Generally, the compound is one which expands with a temperature rise to urge the pin 62 outwardly, and contracts with a temperature reduction to enable the main spring 52 to move the pin 62 inwardly. At temperatures above 180° F. essentially all of the oil is routed through the cooler 18. This causes severe damage to the transmission over time because it is not being adequately cooled by the transmission cooler. Buy Tru-Cool Long brand Transmission Cooler External Thermal Bypass 708-4739P6: Engine Oil Coolers & Kits - Amazon.com FREE DELIVERY possible on eligible purchases I am removing the tip from a 2000 Boxster right now using the Bentley Manual and it has been great until the point of unbolting from engine and it is not clear on removing the selector cable from the tiptronic. In addition, the flange 50 also blocks oil from passing from the cooler return port 40 to the port 36, thereby preventing oil from entering the cooler 18 through the cooler supply port 38. As you can see here, the factory bypass valve (top right port) hinders fluid flow tremendously, forcing ATF to flow through what is maybe a 1/8-inch gap at best. Throughout the course of the drive, and even on the 60-mph highway section of the trip, the Allison’s transmission temperature never leveled off. In the cooling position of FIG. The springs 52 and 66 bear against opposite faces of the wall 72 so that the valve member 46a "floats" in the same manner as the valve member 46 of the first embodiment. At temperatures above 180° F. the valve member causes essentially all of the engine oil to circulate through the oil cooler. Each unit is also anodized in the company’s signature green. In this position engine bypass oil flow from port 34 to port 36 is blocked by the end wall 72, which is held in the position illustrated by the thermally extended pin 62 of the thermostat 54. From the factory, your truck has a transmission cooler bypass so that when cold, the fluid bypasses the transmission cooler for faster warm up. This result is made possible by the offset relation of the ports 36 and 40 previously mentioned. One is through the cooler and back to the engine through the port 36, and another is from the port 34, through the valve chamber 42, and then through the port 36. From the factory, all Allison-equipped ’17-’19 Chevrolet and GMC HD’s employ an auxiliary transmission cooler bypass valve to c While lowering the factory air box into place, be mindful of where the mass airflow connector is, make sure the coolant bleed-off hose is out of the way, and avoid damaging the charge air temperature sensor. A simple piece with a lot of R&D behind it. The LDP L5P trans cooler bypass valve! In the warm-up position of FIG. One path is through the cooler and back to the engine through the port 36, while the other path is from the port 34, through the valve chamber 42a, through the passages 76, and then through the port 36. If the transmission oil cooler is equipped with a thermal bypass valve that can be removed from the cooler lines, disconnect the lines from the bypass valve when performing the flushing procedure. The B&M cooler can only lower the oil temperature by 20 degrees +/-. It’s coupled to the passenger side of the radiator and is tied in with the transmission cooler lines. To keep one key variable the same, all of our before and after testing was conducted along the same 10-mile test loop. Sonnax cooler bypass valve kit 36605-02K allows the bypass valve assembly to be rebuilt, salvaging the OE fittings, and maintains cracking pressure at 70-75 psi. Not only is this one of the largest transmission coolers available, but has the highest GVW rating of 40,000. It was summer, the Allison had already been built and was seeing more than 290 psi worth of line pressure, and the truck was towing. The company’s transmission cooler bypass valve provides full flow to the auxiliary cooler and drops ATF temps by as much as 60 degrees. Once the snap-ring is in, it’s wise to use a small flat head screw driver to ensure the snap-ring is both fully seated and spread out. A flow divider or valve member 46 is located in the valve chamber 42 and includes an elongated cylindrical body defining a through passage 48 and having a circular flange 50 adapted for engagement in substantially fluidright relation upon the valve seat 44. Pulling the bypass valve begins with the removal of the snap-ring up top, which we made quick work of with retaining ring pliers. Thanks to its one-piece design, which is void of the factory thermostatic valve capsule and spring, the orientation of the LinCo bypass valve isn’t a concern when installing it. Various modifications and changes may be made with regard to the foregoing detailed description without departing from the spirit of the invention. Thus, any movement of the spring retainer 60 to the left, as viewed in FIGS. Field of the Invention. Use a pair of pliers to grab ahold of the nipple on the factory bypass valve and rotate the valve back and forth in its bore. average) Easy install, drop in replacement…can be done in-car when servicing the valve body. The valve 68 is a sleeve valve, compared to the poppet valve 50 of the first embodiment. From the factory, all Allison-equipped ’17-’19 Chevrolet and GMC HD’s employ an auxiliary transmission cooler bypass valve to control fluid flow to the auxiliary cooler. Once the retainer is in place, the two legs on the air box can be forced into their respective grommets. The valve actuating mechanism is designed to allow oil to pass through the valve despite incorrect connections between the ports of the bypass valve and the ports of the oil cooler and oil source. Its opposite ends engage the spring retainer 60 and the adjacent face of the valve member flange 50. After modifying the bypass valve to send more fluid to the auxiliary cooler, transmission temp didn’t exceed 165 degrees for the rest of the summer—and the idea for a simple, affordable, drop-in bypass valve was born. A transmission cooler is a must, but I have no need for a thermal bypass. This way you know the valve is clean, which makes it easier to check for leaks later. With this upgrade the operating temperatures are typically maintained at around 70 degree celsius even under hard working conditions. The thermostat 54 also comprises an intermediate body portion 58 freely axially movable within the passage 48 and mounting an annular shoulder or spring retainer 60 at one end. I get my PML pan tomorrow so I might throw that on first. Unfortunately, the bypass valve is extremely restrictive and doesn’t allow adequate flow to the auxiliary cooler, even when the auxiliary cooler is needed most. I had to bitch and bitch because it did not pull any codes. The bypass valve 10 comprises, generally, an elongated cylindrical housing 24 closed at one end by an integral wall 26 and at the other end by a cap 28 held in position by a threaded connection 30 which is rendered fluid-tight by a suitable O-ring 32. A helical relief bias means or compression spring 66 is disposed about the thermostat body portion 58. Hardened steel T-valve provides secure checkball seat and adequate bypass flow; New spring cracks open at 70–75 psi to provide lube if cooler is blocked or restricted Specific details of the thermostat 54 will therefore be omitted for brevity. Lockhart Industries, Inc. (Paramount, CA), 236/93A, 251/80, 236/34.5, 236/93A, 236/99J, 165/35, 251/80, Click for automatic bibliography No. Such modulation enables more precise control of oil cooling. Unfortunately, the bypass valve is extremely restrictive and doesn’t allow adequate flow to the auxiliary cooler, even when the auxiliary cooler is needed most. If you hear it snap into place, you know it’s been correctly installed. When the truck was dropped off at LinCo Diesel Performance’s Troy, Missouri facility, he reported seeing transmission temperature climb higher than 210 degrees on a daily basis. Such damage can include cracking of the valve member mounting, or internal failure of the thermostat itself. These self-actuating thermal bypass valves monitor inlet flow and automatically divert the fluid based on temperature to one of two outlet ports. The 2013 and new 68rfe equipped Ram trucks have always been known to run hotter than then their early predecessors. Full time cooler flow with much lower average fluid temperature; Built in high pressure safety bypass into the lube circuit; Immediate and accurate fluid level check without warm-up cycle, which saves tech time for re-racking and rechecking. It is impossible to unseat the valve member to relieve excessive system pressures which may occur if the valve ports are improperly connected to the engine or cooler. (45 min. The cooled oil passes from the cooler 18 by means of the line 22 to the valve 10 and back to the engine 12 by means of the line 16. LinCo Diesel Performance’s transmission cooler bypass valve is CAD-designed, CNC-machined, and features smooth radius’s for optimum flow. My cooler received very little flow and did not change regardless of transmission temp. Thinking on their feet, the guys at LDP came up with an Allison-saving solution that costs $59.99 shipped and installs in less than 10 minutes. & Terms of Use. Next, we moved on to wrestling the factory air intake back into place, which is the most time-consuming part of the entire install. 3 to that of FIG. 4, but illustrating the components in a warm-up position. Once this temperature is reached, oil is allowed to flow to the transmission oil cooler. Such a thermally responsive compound in a thermostat 54 of the type described is well known in the prior art. The idea of tinkering with the transmission cooler bypass valve came to the guys at LinCo after seeing transmission temp creep up to 215 degrees in their L5P-powered shop truck. If you live in a colder climate and plan to reinstall the valve for winter driving, it has to be reinstalled this way (with the recessed half-moon facing forward, toward the auxiliary cooler lines). An angled pick works best for fishing the spring out. & Terms of Use. 68RFE Transmission Cooler Thermostatic Bypass 2013-18. According to the present invention, an oil cooler bypass valve actuating means is provided for use in conjunction with a bypass valve of the type which includes a valve housing having a valve chamber communicating with oil supply, oil return, cooler supply and cooler return lines; and a valve member having a cooling position for directing oil from the oil supply line to the cooler supply line for circulation through a cooler, and then from the cooler return line to the oil return line, and having a warm-up position for directing oil from the oil supply line back to the oil return line. Referring now to the drawings, there is illustrated an oil bypass valve 10 connected to an engine 12 by an oil supply line 14 and an oil return line 16. On a typical winter day in early March with an ambient air temperature of 38 degrees F, we hopped in the Denali and set out along the test loop. If you work your L5P Duramax for a living or on the weekends and have noticed your Allison running warm, you’re not alone. 3 to the cooling position of FIG. A thermostat 54 is located in the valve chamber 42 and is responsive to an increase in temperature of the oil in the chamber 42 to move the valve member 46 from the warm-up position of FIG. In every case this substantially reduces transmission temperatures. This will help break both internal O-rings loose. This cooler is a "stand-alone" cooler designed to handle the heat load by itself, but in the 99-03 Ford trucks it can be used as an add-on cooler in addition to your OEM cooler. Referring now to FIGS. A thermally responsive compound (not shown) located within the body portion 56 expands with a rise in temperature, urging the pin 62 axially outwardly, and thereby causing the spring retainer 60 to move from the position in FIG. During the install and in the time between our initial test drive with the stock bypass valve in the mix, the Allison’s fluid temp had cooled off to 129 degrees F (from 156 degrees). The bypass valve shuts off flow to the transmission oil cooler until a predetermined fluid temperature has been achieved. A major selling point for LinCo’s bypass valve is that you don’t have to break any transmission lines loose to install it. In cold weather, it allows transmission fluid temperature to warm quickly. If you work your L5P Duramax for a living or on the weekends and have noticed your Allison running warm, you’re not alone. Privacy Policy Once seated such a valve member is susceptible to at least two malfunctions. A valve actuating mechanism for an oil cooler bypass valve of the type in which a thermally responsive element expands to ... 165/35, 251/80 . Further, since the valve member is acted upon on opposite sides by the main bias means and the relief bias means, respectively, either of these bias means can be overriden under certain circumstances to relieve excessive system pressures which might otherwise occur if the valve ports were improperly connected to the engine or cooler. The spring rate of the spring 66 is greater than that of the spring 52. 10-Second Tow Rig: Daily-Driven 900-HP Cummins? Following some before and after testing, the bypass valve dropped transmission fluid temp by 49 degrees, and it did so on a 38-degree winter’s day. The housing 24 further includes an elongated cylindrical valve chamber 42 having a portion adjacent the wall 26, and a larger diameter counterbore portion adjacent the cap 28, the different diameter portions defining an annular shoulder or valve seat 44. It should be understood that these temperatures are merely exemplary and are not critical operating limits. For our install, Trans-gel assembly lube was used, but transmission fluid, silicone lube, or even Vaseline will work just as well. In one embodiment of the invention in which the valve member is seated against a valve seat in its cooling position, further expansion of the thermally responsive element can occur without damage to the bypass valve components since the expansion is accommodated by compression of the relief bias means. I pulled this from an AMSoil site. 4. The bypass valve is supposed to open around 190 degrees to allow flow to the transmission cooler. The valve member 46 "floats," being movable by the thermostat 54 through the resilient bias of the relief spring 66. Once free from its mounting fasteners, the air box lifts up and rolls out of place. The LDP L5P trans cooler bypass valve! With a poor cooler or none then fluid temps in the sump can be 250+ degrees and potentially blow out the vent In the top of the trans. Mine is the same 180 degree cut over valve but the reality is it starts to close the bypass starting in the 165 sump temp range. 3 is a view similar to FIG. Transmission Cooler Bypass Valve - Read online for free. The appropriate cooler flushing adapter, if needed, should be connected to the supply and return lines at the transmission. 4, oil from the engine 12 enters through the oil supply port 34, passes through the cooler 18, and then is returned through ports 40 and 36 to the engine 12. 3 and constitutes the "warm-up position" of the valve member 46. Keep reading for the full scoop on the valve, our testing, and the easy install. This is one mod every L5P owner should be considering. T he cooler flow control valve guarantees full time cooler flow for greater transmission life and lowers average operating temperatures of up to 20 degrees celcius. LinCo DIESEL PERFORMANCE-TROY,MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks. HOME OF THE PATENT PENDING L5P TRANSMISSION COOLER BYPASS VALVE PLUG! Hot Rod RV Ram: A 1997 Dodge Ram Cummins For The Modern Age. Unfortunately, the bimetallic valve commonly fails in the closed position, causing hot transmission fluid to constantly circulate right back into the transmission, never, or barely, passing through the cooler at all. 4 and 5, there is illustrated another bypass valve 68 according to the present invention. The Next Frontier To Duramax Drivability: Duramaxtuner ECM/TCM Matched Tuning Software. This seated position of the valve member 46 constitutes the "cooling position" of the valve member 46, in which substantially all of the engine oil is constrained to flow from the valve chamber 42 into the oil cooler 18 through the cooler supply port 38, and substantially all of the oil from the cooler 18 is constrained to flow from the cooler 18 into the chamber 42 and back to the engine 12 through the oil return port 36. So long as the O-rings are lubed, it reduces the chances of rolling or tearing them during installation. 1 is a perspective view of an oil cooler bypass valve, diagrammatically illustrating its connection to an engine and an oil cooler; FIG. In a typical application oil at a temperature less than 160° F. is routed back to the engine. It’s important to note that the factory transmission cooler is in no way undersized, blocked by another heat exchanger, or inadequate in the L5P trucks, it’s simply not being utilized like it should from the factory. One end of the skirt 70 is closed by an end wall 72 having a central opening 74 just large enough to allow relative axial movement between the valve member 46a and the thermostat 54 without allowing significant fluid flow in the clearance space. In the cooling position of FIG. It only kept climbing. To see its product in action, we stopped by LDP’s Troy, Missouri facility, where it was being installed on a ’19 dually. 2 is an enlarged longitudinal cross-sectional view of the valve of FIG. Lowering the restriction of flow into and then back out of the bypass valve is the key to the 40-60-degree drop in fluid temperature end-users see. In one embodiment in which the valve member comes into engagement with a valve seat, the relief spring is adapted to accommodate expansion of the element subsequent such seating whereby damage to the bypass valve components is avoided. We ended up with no bypass. Oil from the engine 12 enters through the oil supply port 34, passes through the cooler 18, and then is returned through ports 40 and 36 to the engine 12. Once installed, the Christmas tree retainers can be popped back into place as well. A valve actuating mechanism for an oil cooler bypass valve of the type in which a thermally responsive element expands to urge a valve member against a valve seat and thereby cause oil to flow through an oil cooler. 180 +-. Valve member 46a, like valve member 46 of the first embodiment, is operative to modulate return flow of oil to the engine 12 and through the cooler 18 in positions intermediate its cooling and warm-up positions. Prior to installing the LDP bypass valve, its O-rings need to be properly lubricated. Before you pull the factory auxiliary transmission cooler bypass valve, it’s important to take note of the orientation of the recessed, half-moon shaped portion on its exterior. 2. ... the fluid temp is generally 100-120 degrees F above ambient air temps. Part #: 91306ERL. Details of the cooler 18 are omitted for brevity since suitable coolers for cooling oil are well known in the art. A plurality of equally circumferentially spaced flow passages 76 are provided in the skirt 70 to permit oil flow from the valve chamber 42a through the valve ports coming into alignment with the passages 76. Similarly, should the engine supply line 14 be connected to the oil cooler return port 40, and the engine return line 16 be connected to the cooler supply port 38, the main spring 52 compresses and allows the flow of engine oil to be diverted through the cooler and return to the engine. Once in the factory block, the valve can be pressed straight down until it is fully seated. However, the relief spring 66 compresses under these circumstances and allows oil to return through port 40 to the engine 12. Accordingly, like numerals are employed to designate like parts, and generally comparable but not identical parts are designated like numerals with letter subscripts. This by pass is included in the Tru-Cool 4739 cooler. This position is illustrated in FIG. Simply put the blade between the two ears of the snap-ring and twist. As we go to press, LinCo offers the only drop-in bypass valve like this in the aftermarket. If it’s reinstalled incorrectly, the auxiliary cooler will see even less flow than it originally did. From there, needle nose pliers should be used to extract the thermostatic valve capsule (shown). At the end of our test, and with an ambient air temperature of 40 degrees, the Allison’s 107-degree reading was just 67 degrees above ambient. Out in the real world, even bone-stock L5P owners are seeing ATF temps higher than 210 degrees. For example, if oil supply line 14 were connected to the cooler supply port 38, and the engine return line 16 connected to the cooler return port 40, the pressure drop associated with flow of the oil from port 38 to port 40 and back to the engine 12 through the annular space between the valve chamber 42 and the valve member 46 would cause a prohibitively high pressure drop. Looking for transmission coolers? The spring 52, valve member passage 48 and valve chamber 42 are generally coaxial, the diameter of the coils of the spring 52 being such that there is ample space for spring extension and retraction relative to the walls of the chamber 42, and relative to the cylindrical postion of the valve member 46 encompassed by the spring coils. In this case a low temperature in the sump can be helped with a thermostatic valve. Needless to say, this is where we began the second test drive—and it was the highest temperature we would see with LinCo’s bypass valve in place. I've been able to monitor this effect on other cars I've had with a diagnostic interface and always had to restore the radiator cooler because the transmission temps would soar above 220 degrees with just an aux cooler alone. There also have been numerous melted down transmissions due to the bypass valve … Secondly, the components of the bypass valve are often damaged when the thermally responsive element continues to expand, which sometimes occurs when the cooler is overloaded and the oil heats excessively. The OE thermal bypass valve is designed to route bypass the transmission cooler in cold temperatures in order to bring the transmission up to operating temperature faster. 708-4739P6, UPC 621859000111 3 substantially all of the engine oil entering the valve chamber 42 from the oil supply port 34 flows through the annular space between the valve member 46 and the walls of the chamber to the oil return port 36. Ensure all the fluid goes through the transmission cooler in your 2013-2018 Dodge 6.7L Cummins with the ATS 3100052392 Thermal Bypass Valve Upgrade. While we expected transmission temp to rise as the truck came up to operating temp, we didn’t expect it to go 118 degrees over ambient (for those that don’t know, 100-degrees over ambient is considered the ideal operating temp for most transmissions). 60/605.2, 60/298, 165/52, 60/274, 60/320, 123/568.12, 60/288, 165/51, 60/287 . Even though no or very little fluid is lost during the install, it pays to hit the top of the new bypass valve with brake cleaner. Twice as Nice: Home Brewed 1975 F-250 Cummins, Cub Cadet 782D: Little Tractor, Big Smoke. Meet the test mule for our before and after transmission temperature testing: a ’19 GMC Sierra Denali 3500 HD with 14,000 miles on the clock. At temperatures above 180° F. the thermostat 54 will have the effect of extending the pin 62 further outwardly. The flange 50 is located between the ports 36 and 40 so that the oil is constrained to flow out of the port 36 and back to the engine 12. With LDP’s drop-in bypass valve in place (top left port), full flow, in and out, is made possible. Privacy Policy If desired, the ports 34 and 38 could be combined into a single port )not shown) for suitable connection to the lines 14 and 20. The last piece of the factory bypass valve assembly to be removed is the spring (a very stiff spring). California Proposition 65 Warning To allow for improved transmission warmup, a thermostatic cold flow bypass valve has been incorporated into the transmission oil cooler. The housing 24 includes four integral tubes which define an oil supply port 34, an oil return port 36, a cooler supply port 38 and a cooler return port 40 connected, respectively, to the lines 14, 16, 20 and 22. The chamber 42a has a uniform transverse cross section so that the valve member 46a is slidable between the cooling position of FIG. The function of the bypass valve 10 in conjunction with such a cooler also need only by summarized briefly since it too is well known. The engine 12 is exemplary of a source of oil which is to be maintained at a desirable operating temperature, such as between 160° F.-180° F. It will be apparent that the present invention is equally suited for cooling transmission oil or the like. With the air intake reinstalled and the clamps at both ends of the intake tube cinched down, the mass airflow sensor can be plugged back in and locked. Given its location in the engine bay, chances are good that the bypass valve is dirty, so hit it with a little brake cleaner and compressed air (or a rag) before you get started. Read this review and save yourself time and money. The auxiliary cooler is indeed part of the AC condenser, so I need to find out more information about that. Fluid below the valve’s set-point temperature is bypassed to a reservoir or bypass loop while fluid at or above the set-point is diverted to the system’s cooler. Chamber 42a will see even less flow than it originally did 190 degrees allow. 10-Mile test loop the auxiliary cooler will see even less flow than originally! The prior art systems, such as that of the oil cooler 18 the owner runs roofing... Amount of time it takes to read this article, the two legs on transmissions... ; FIG a cooling position ; FIG closed position further service the top the pin 62 further.... Is CAD-designed, CNC-machined, and features of the invention, 60/298, 165/52, 60/274,,! My cooler received very little flow and automatically divert the fluid temp is 100-120. Type described is well known in the Midwest, LinCo Diesel Performance ’ s signature green and... An emissions-friendly tow tune but no TCM tuning, so I might throw that on first is made possible the! Difference with the bypass valve is unfit for further service forced into their respective grommets compression spring.! Apparent from consideration of the factory bypass cooler valve, its O-rings to! 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Article, the flange 50 is seated upon the valve member 46a is between..., needle nose pliers should be used to extract the thermostatic valve (... Ram trucks have always been known to run hotter than then their predecessors. Modulation makes it possible to more precisely control the degree of oil cooling description taken in connection with the 165 degree transmission cooler bypass valve...