Did you have the vehicle control modules checked for DTC'S - diagnostic trouble code's ? Not going to a part's store an having it checked . Need to have a professional type scan tool hooked up , check code's in the BCM - body control module , the instrument cluster can also have DTC'S stored . Auto part stores can not check these code's .Viewing engine sensor data to the PCM to see what the real temp. is . Coolant temp. sensor is an input to the PCM/ECM - engine computer , this info is sent to the instrument cluster over the class 2 serial data network .Do you know what a automotive communication network is ? Plus GM had stepper motor problems in their instrument cluster's from 2003 to 2006 . The stepper motor is what controlls that needle .
How to repair GM Instrument Cluster Speedometer Gauge Stepper
SOURCE: Problem with No Heat on 2005 Chevy Avalanche - Cooling System?
It sounds like a water pump to me. Check the pump for leaks. then tak off the radiator cap. Start it up and watch, to see if the water circulates. (ONLY TAKE THE CAP OFF WHEN ENGINE IS COOL)
SOURCE: chevy avalanche won't start
another person wrote this, I was trying to find more info for you.
I'm answering my own post so other's may reference. The problem was my
Powertrain Control Moudle (PCM) kept blowing out due to a bad fuel pump.
so if you are inclined to check, your fuel pump can still work and not work correctly. So this needs to be tested under correct measures. More than likely on the truck. But I would locate the PCM and check to see if its blown.
If I find anything else I will forward it to you.
tepfy
SOURCE: I have a 2005 chevy Impala temp gauge going crazy
faulty stepper motors in your cluster. and its 03-06 GM vehicles that are affected. and no there isnt a glitch in all chevy cars you smoke too much u paranoid freak. you can fix this yourself for about 40 bucks. heres how i did it. click the link
http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=28085&highlight=
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