If you've done the research and decided that you need a bigger transmission cooler, or your current transmission cooler has sprung a leak, you will need to install a new one. The good news is it's actually a very easy job that can be done in your driveway with regular tools. For some reason whenever we start discussing transmission repair, even seasoned home mechanics start to get a little freaked out. It's understandable considering the inside of an automatic transmission is a very involved place to be. But the cooler install or upgrade (which is also an install, of course) is one of the easier jobs to do on the system.
Read on to remove your old transmission cooler and install the new one.
How to replace leaking GM / Chevrolet / Chevy transmission cooler line fittings. Chevrolet / GM transmission cooler line fittings leaking solved! These trans cooler line fittings are used on. How To Add An Automatic Transmission Cooler To Your Vehicle. Posted by Regis on Monday, August 5th, 2013 If you’re a regular follower of my articles on automatic transmissions, you’ve obviously heard me preach over and over again how important it is keep your automatic transmission temperature cool.Heat is by far the number one killer of transmissions. Writeup on tranny cooler install. TRD Transmission Cooler - 3rd Gen 4Runner - YotaTech Forums. If you put the inlet going into the bottom port the heat will follow the fluid all the way up and out of the cooler. I mounted mine with the inlet going into the top port. I measured my trans temp (from the outside with an infrared therm).
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Remove the Retainer Clips![]()
Removing the transmission cooler isn't a difficult endeavor on most vehicles. The nice thing about trucks is the fact that most are pretty big, and have lots of room for things like tranny coolers. This means removing and replacing them isn't one of those jobs that requires yoga.
The steps listed below assume that you have peeled away the layers of your truck that are hiding the transmission cooler location. In most trucks, like our Chevrolet Silverado, you need only remove the grill to access it.
The first step in removing the cooler is to disconnect the transmission fluid lines at the cooler. There will be two lines connected to the cooler, an input and an output. It doesn't matter which one you disconnect first. The lines are protected from wiggling loose on their own by a plastic retainer that slides over the actual nut holding the line in place. This safety retainer keeps also protects the connection itself. It must be disconnected before you can loosen the line nut on each side of the cooler. They're easy to remove, simply pop them out of the way with a screwdriver.
TIP: It's possible to replace the transmission cooler with very little fluid loss. Careful work will mean little or no fluid refilling before you are able to drive again.
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Disconnect the Transmission Fluid Lines
With the safety clips removed, move your catch tray into place somewhere under the transmission cooler. If you have a helper you can have him or her hold the catch tray directly under the cooler to catch every drop of the fluid. If not, don't worry. It's a little bit nasty but not too dangerous.
How To Install A Transmission Cooler On A Th350 Fluid Switch
Using a line wrench if you have one, or a properly sized open end wrench if you don't, loosen the line nut on the incoming and outgoing transmission fluid lines and pull the lines carefully away. The lines are not super delicate, but take care to avoid crimping them. A crimped line will usually have to be replaced, and that is not a fun job at all.
TIP: Transmission fluid can harm the plastic and painted finishes on your truck. Protect exposed areas before you disconnect your lines.
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Removing the Transmission Cooler
With the lines disconnected you are now ready to get the old cooler out of there. The cooler is attached to a bracket, which is attached to your radiator core support. Remove the screws or small bolts attaching the mounting bracket to the core support and you will be able to pull the transmission cooler out. Then you can remove the bracket because you may need it to mount your new cooler, depending on whether you upgraded to a heavy duty transmission cooler or you're simply doing a replacement.
Installing the new transmission cooler: As the saying goes, installation is the reverse of removal. If possible, pre fill the new cooler so that there will be less air in the transmission fluid system. Once installed and tight, crank up the engine and check for leaks. This also gives a chance for any air pockets to vacate and you can check your fluid level accurately.
Many of you add aftermarket coolers to your cars and this is always a good idea. Here are some hints.
How To Install A Transmission Cooler On A Th350 Fluid Fluid
1-Always mount the cooler in a place that has good air flow and if mounting in front of the radiator always make sure the fin's in the cooler are parallel with the fin's in the radiator to avoid restricting air flow to the radiator. If you must place the cooler in and area with little air flow a FAN is a must.
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How To Install A Transmission Cooler On A Th350 Fluid Kit
2-When Installing coolers make sure lines are clear of anything that can rub them and always use line that's approved for transmission/hydraulic fluid. Fuel line will not work and will break down in transmission fluid.
B&m Transmission Cooler
3-By passing the radiator is the way I prefer a cooler be set up. Generally the transmission will run cooler this way and additionally this may take some of the load off the radiators job of cooling the engine.
4-When hooking up multiple coolers several things should be noted. The cooler itself is a restriction of flow and this restriction while not a problem for the cooling or lube to the trans can cause excessive pressure inside the converter. This can force the converter against the flex plate more so than normal and cause wear to the engine thrust bearing. A stopped up or severely restricted cooler or cooler lines can do the same. So when installing more than one cooler its advised to put them in parallel with each other, This means one line from the trans is split with a Y and one line run to each cooler then out of each and into a Y back to a single line running to the trans. This will assure adequate cooling while reducing the wear to the engine thrust bearing. Always use line that's at least as large as the inlets in the cooler, Avoid extreme twist or turns in them particularly with rubber lines.
5-Type and brands of coolers; I really have no preference here as far as brand. From my experience and expensive brand name or a generic unit appear to do the same job. I have found the stacked plate (Flat tube) Types when measured inlet to outlet temp drop tend to be more efficient in the same dimensional sizes with a greater temperature drop. I did a test once with two coolers in parallel one round tube and one flat with a laser thermometer to determine this.
6-This is not specifically about a cooler but about cooling. Always be sure that the metal lines coming from the transmission under car do not contact the headers or exhaust. I once had a car where the transmission temps would sky rocket when the car was being run hard and couldn't understand why. I after some looking around found that the cooler lines in and out were pinned against the headers. This would super heat the fluid when the headers got hot. Moved them away and the problem was solved, So always keep trans cooler lines factory or otherwise as far away from the exhaust as possible.
Opus chords sans font. 7-Trans temps- This question gets ask a lot. What's TOO HOT? Well ideally you want you average temp to stay under 190 degrees however I would not get to concerned till the temps get at and or over 230 degrees. Heat can damage a trans but with the exception of extreme heat 250 or higher this damage is a long term killer by breaking down fluid and causing rubber seals to harden and break.
8-Never use your cooler lines to remove fluid from your transmission by starting the engine or in and attempt to flush by catching fluid in a pan while adding fluid to the dipstick. When this is done no lube is being sent to the planets and bushings and they can go dry and melt down very quickly destroying or significantly shortening the life of your transmission.
9-It is advisable to fully and properly flush a cooler especially when a converter failure is involved. Where a transmission internal failure is unlikely to put debris in the cooler since all fluid coming from transmission must travel through the trans filter. The fluid coming from the Pump or converter does not and any debris from these will certainly end up in the cooler. Its always a good idea to power flush a cooler or replace after a failure but is particularly important in the case of this type failure. Anything that's in your cooler or lines will end up in your Valve Body, Bushings and Planets. A cooler cannot be properly cleaned simply by blowing air through it. A can of cooler flush which most transmission shops and or transmission parts suppliers should have followed by a blow out with air is the correct way to do it.
Hayden Transmission Cooler
10-When installing rubber cooler lines to metal lines it's a good idea to put a small flair at the end of the metal line. Not too big because you will tear the line on the inside during install. Then place a clamp just ahead of the flair. Also roughening up the outer surface of the metal line with very coarse sand paper in area where clamp will ride will help assure a good seal and reduce the possibility of blow off. Never over tighten clamps to the point of the rubber oozing through or being cut this will cause a failure too.
11-Temp sending units- The best place for these is in the pan since that will give the best average temperature which is what's important, using the pressure port is ok however you will show temps 10 to 20 degrees higher average than you would in the pan. I do not suggest placing temp senders in either the inlet or outlet from the cooler as they will increase cooler restriction and increase the odds of a leak.
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