Too cool for Tranny - Fiberglass RV


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Old 08-12-2012, 09:46 AM   #1
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Name: Derek
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Too cool for Tranny

There has been a lot of talk about the merits of a transmission cooler because it keeps the tranny fluid cooler when towing. This is fair enough advice. Many only to on an occasional basis. As a result, the transmission cooler is only needed a small percentage of the time. An engine generally runs better once it has warmed up a little. Is there any consequence in a transmission running too cool? Thoughts?

Derek
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Old 08-12-2012, 10:12 AM   #2
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You bring up a good point Derek. I'm not sure about transmission temps possibly running too cool, but it is possible to have problems if engine oil runs too cool. Which is why the modern way to "control" engine oil is to pass it thru a heat exchanger that is part of the engine coolant system. That way, the oil runs in a range that is "the right" temperature, instead of too cool, or too hot.

I suppose that in very cold weather you could run a tranny too cool if you had a regular old fashioned "air" cooler plumbed in, but again, coming from me, that is just a guess.
Maybe someone with experience rebuilding auto trannies could chime in on this. I have almost zero experience with auto trans, as I have always been a manual transmission kind of purchaser.

george
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Old 08-12-2012, 11:06 AM   #3
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The service manager where we buy our vehicles told me that both our Chrysler minivan, no tow package, and our Chevy Silverado with tow package, have transmission coolers. FWIW
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Old 08-12-2012, 02:18 PM   #4
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Another issue that this topic brings up is the "transmission cooler bypass valve.". Any thoughts for or against one of these?
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Old 08-12-2012, 04:11 PM   #5
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The cooler the better for a transmission. If you change the fluid in accordance with your manual, it will last forever.
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Old 08-12-2012, 06:11 PM   #6
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Heat is the number one killer of transmissions followed by lack of servicing.

Even putting a bypass on in my view just means one more thing to leak down the road.
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Old 08-12-2012, 08:06 PM   #7
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Cold transmission oil

Quote:
Originally Posted by glamourpets View Post
Another issue that this topic brings up is the "transmission cooler bypass valve.". Any thoughts for or against one of these?
When I lived in northern Minnesota ,the morning temperature would reach -50 Deg F (70 below windchill) .The automatic transmission fluid would thicken up and you could put the car in drive , give it some gas and it would just sit there for what seemed a lifetime then finally move. We would then drive 4 or 5 miles in first gear (D1) until the fluid warmed up enough so the transmission would shift. I was told the bypass valve was to help bring the transmission up to proper temperature faster. Another trick was to tie the gas line to the heater hose and insulate around both lines so the fuel was warmer when it reached the carb. I am not an automotive engineer , I just know it worked
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