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I am posting this because even though I found plenty of P0128 code threads, none were exactly like my problem. Hopefully this will help someone out. Sorry ion advance if I posted this in the wrong spot
08 Chevy 'rado, I-5, auto
A/C OFF in the info center, so no more air conditioning
This happened on and off all summer
Finally throws a code P0128 (coolant temp below thermostat regulating temp)
This problem would come and go for weeks at a time, time will tell if it's been solved but so far so good.
08 Chevy 'rado, I-5, auto
What happened
Temp gauge turns off, needle rests at the off positionA/C OFF in the info center, so no more air conditioning
This happened on and off all summer
Finally throws a code P0128 (coolant temp below thermostat regulating temp)
How I fixed it
For those that don't know, the truck will shut the a/c off automatically if the engine gets too hot. Initially thought it was a thermostat problem, but this would not explain the temp gauge failing also. Replaced the coolant temp sensor, cleared the code and so far the problem has not come back. This makes sense, when the sensor acts up it turns off the temp gauge, and when truck realizes it doesn't know the temperature of the engine it shuts off the a/c just to be safe.This problem would come and go for weeks at a time, time will tell if it's been solved but so far so good.