transmission almost always in "cold" mode

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Dec 2, 2003 | 11:35 PM

#11

graygmc

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From: fort worth, TX

Quote:

Originally Posted by Flyer

I remember reading in the Owner's Manual that this was a feature to help heat the engine up quicker when it was cold outside so you would gain use of the heater sooner. It should begin shifting normal after everything warms up though.

Can you ATAP it and see what your tranny temps are?

yea thats true. i dont have ATAP but i know my temps are at operating temp.

Dec 2, 2003 | 11:44 PM

#12

Flyer

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From: Armpit of East TX

I figured as much too after I put my cooler on, but ATAP said they never got above 118 on a 30* night, with me driving hard.

Dec 6, 2003 | 07:44 AM

#13

deezel

TECH Regular

Joined: Nov 2003

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From: Dallas

I ran across this in a TSB...

Quote:

Ref. GM TSB#01-07-30-031

TCC Operation
If the transmission fluid temperature is less than 17°C (62.6°F), torque converter clutch (TCC) operation will not occur until the transmission fluid temperature is greater than 20°C (68°F).

(2001 Model year) When the engine coolant temperature (ECT) reaches 77°C (171°F), 2-3 and 3-4 upshifts will follow the normal shift patterns. A brief description of operation is also included in the Owner's Manual.

(2002 Model year) When the ECT reaches 80°C (176°F), 2-3 and 3-4 upshifts will follow the normal shift patterns. A brief description of operation is also included in the Owner's Manual.

So, the higher shift points are linked to the engine coolant temp. and the TCC operation is linked to the transmission fluid temp.