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Radiator and Trans Cooler
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RE: Radiator and Trans Cooler - 5/31/2007 5:13:37 PM
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joer@jobe.net
Posts: 4
Joined: 5/31/2007
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"When" is the key word. When mine went out I looked at putting in an after market cooler until I looked real close. On 1/2 ton Chevy's it runs from the transmission to the transmission portion of the radiator and then back to the transmission.
On three quarter ton and above, or those with trailering packages a cooler is added. It now routes from the transmission to the transmission side of the radiator then to the cooler then back to the transmission.
When the transmission side of the radiator blew into the main radiator and out the radiator cap I decided aftermarket. The problem was that it was no bigger than the cooler that was there. So I just used the existing cooler.
Now it routes from the transmission to the cooler then back to the transmission.
Lots of engine and transmission fluid and filter changes later I "seem" to be OK.
Any other ideas?
Joe R.
_____________________________
Joe Rasmussen
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RE: Radiator and Trans Cooler - 5/31/2007 7:26:05 PM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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We know there is a problem with the cooler line. It is not a mater of if it breaks but when. The cooler lines runs inside the radiator and over time it break inside the radiator therefore mixing the trans fluid and radiator fluid together. It only takes a few minutes for it to burn the clutches in the tyranny. When mine busted a couple of weeks ago my tyranny was fried only going 2 blocks. The bad part is that I know this and have not had time to fix my own truck. My cooler is in a box under my desk were it has been for about a month. We put one on Dans truck but never got around to doing mine. What you need to do to fix this problem from happening is to DISCONNECT the internal trans cooler and plug it off. Then you can add the external cooler. I will post a detailed way to fix this problem. I know the gramme is not right and Holly is not here to fix it. GM will fix the truck and transmission as long as your covered under warranty factory or the extended warranty. They will not put on the extrenal cooler. This is not only a hummer thing. The cadillac escalade do it also.
< Message edited by auggie mathis -- 5/31/2007 7:41:01 PM >
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RE: Radiator and Trans Cooler - 5/31/2007 7:26:42 PM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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The Problem
After having already added an additional transmission cooler, transmission and engine temperatures were running within accepatble limits. However, the many reported cases of main radiator failure, allowing transmission fluid and coolant to mix together, were of some concern, especially on a vehicle no longer covered by warranty. Transmission temperature would also still get a little hot when the torque convertor was out of stall (not locked up) for extended periods.
Stock Transmission Cooling
The transmission is cooled in two places, the passenger side of the main radiator core and the transmission cooler in front of the main radiator core. Both of these will have some effect on the temperature of the engine coolant section of the radiator core.
The Solution
The stock transmission cooler, as well as the additional cooler added previously, were both removed. The main radiator element of the cooling circuit was disconnected and the radiator plugged to prevent coolant loss in the event of failure of the partition between coolant and transmission fluid. A Hayden 405 Ultra Cool (10" 15.5" x 3/4") transmission cooler was mounted in the stock location.
It should be noted that the main radiator core does act as an heat exchanger to some extent. In cold climates it will warm up the transmission fluid, as optimum operating temperature is around 175F. In warmer climates, this is unlikely to be a concern.
Installation
First everything was removed, the stock cooler, the additional cooler previously added, all unnecessary pipes/hoses/etc. Everything forward of the stock cooling circuit from the two connectors at the base of the main radiator was removed. It was easier to remove the passenger side wheel well liner to access the lower connectors at the main radiator. Two blanking plugs were used to plug the radiator.
The rivets holding the stock cooler to the mounting bracket were drilled out. The Hayden 405 was put in place in front of the a/c radiator with the mounting bracket over the top and the location of the mounting holes marked. Both were then removed, and the through radiator mounts supplied with the cooler were used to attach the transmission cooler to the stock mount.
Braided hoses were attached to the cooler and the complete assembly was mounted in the stock location. It is easiest to leave the hoses a little longer than required, then cut them to the exact length you want after they have been routed, making suring to leave a couple of inches to slip over the existing pipes.
Double check all fittings and top up transmission fluid as required. Thoroughly clean the area of any spilled ATF, so identifying leaks is easier, and after a test run check for any leaks, check again in 500 miles.
Results
The transmission now runs at around 185F on the highway, and reaches 200-205F with the torque convertor out of stall (generating most heat) running against a strong head wind at 70 mph. Engine temperature stayed consistent at 200F.
Update: On long trips the transmission still gets hot (225-230F) when out of stall for a long time. When stalled it runs cool.
Click on an image below to enlarge
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RE: Radiator and Trans Cooler - 6/6/2007 9:01:32 AM
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john
Posts: 1
Joined: 6/6/2007
Status: offline
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49,000 miles 2005 h2 cooler in radiator went, still under time for warintee, trans needs overhaul, rad and hoses need replacing dealer wants 5,900 for the job still working with gm also spedo stays at 65mph, wind noise at doors, door pockets broken, noted upper rad hose is wearing due to part of air intake rubbing on it
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RE: Radiator and Trans Cooler - 6/11/2007 2:40:53 PM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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I agree just make sure you disconnect the factory one.
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RE: Radiator and Trans Cooler - 8/21/2007 7:58:43 AM
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sailor92a
Posts: 8
Joined: 8/20/2007
Status: offline
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Has anyone put a trans cooler on an h3 and its location?
_____________________________
robert frey
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RE: Radiator and Trans Cooler - 8/21/2007 9:35:26 AM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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None that I have seen or heard of.
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RE: Radiator and Trans Cooler - 8/21/2007 9:51:19 AM
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sailor92a
Posts: 8
Joined: 8/20/2007
Status: offline
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thinking about a trans cooler behind the front skid plate, after drilling holes in it for air flow.
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RE: Radiator and Trans Cooler - 8/21/2007 1:11:48 PM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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i would be afraid that it would get bent up and broke if you were to hit the skid plate on something.
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RE: Radiator and Trans Cooler - 8/21/2007 2:53:44 PM
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copilot
Posts: 149
Joined: 8/15/2006
Status: offline
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That's IF you run the trails like Auggie does!!
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RE: Radiator and Trans Cooler - 8/22/2007 10:38:55 AM
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tomp
Posts: 5
Joined: 8/19/2007
Status: offline
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I am actually going to address this problem a little different. I am currently having an issue when towing in hot weather, where my tranny & engine temps climb as speed increases above 60 MPH. What I plan on dong is swapping out the radiator for a better aftermarket radiator. Opting for solid hand-constructed aluminum radiator that will not seperate internally and allowing antifreeze and ATF to mix together.
This may not fix the tranny temps from rising, so I will probably address that at a later time. I did previously install a larger tranny pan, but the tranny temps still climb.
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RE: Radiator and Trans Cooler - 8/22/2007 3:53:39 PM
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auggie mathis
Posts: 486
Joined: 8/10/2006
What State or Country sugarland texas
Status: offline
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Sounds like you have some great ideas keep us posted.
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