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Myth? Check this. http://www.dieselplace.com/forum/showthread.php?t=202078

It is rumored that cold weather idling will cause leaks to the transmission lines. Severe cold weather, plus high idle mode have caused empty torqure converters to burn up in the trans. (because fluid is too viscous to fill them) Search lines leaking or high idle cold
 

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i'm sorry i didn't sort threw all 51 pages, so i might have missed this. but the recall/ computer update was done to not let the engine go to high idle untill the trans fluid was warmer slightly due to " extensive cold soak".

basically the problem with too high pressure/ pump starvation was due to the fluid being to thick to turn added rpm after sitting for an extended period of time without being ran. i think once she's up and going it's fine.

here is what i got from chev... is this the concern? http://www.dieselplace.com/forum/showthread.php?t=122897

stickboy coverd it great too.... but as my link shows... be carefull with an aftermarket heater too cause ALL the fluid might not be heated. after my comp update my truck can run up to 10 minutes before the elevated idle will come up... guess thats the new norm?
Yup, you found it. Main reason I posted about that was because most of the high idle, torque converter burn ups I saw were in Canada where it gets real cold like countryredneck.
 
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