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If you don' having any wiring issues I would think you should look into the gauge.
The gauge has a memory. It is supposed to stay in its last position when the key is turned off. There would be no more power going to the gauge once they key is turned off so it can no longer read resistance to ground from the sender.
it sounds like a heater door actuator is not allowing the door to swing into the heat position...as for the temp gauge there is a recall for a bad insterment cluster for that truck...a circuit board is cracked in the dash not allowing the gauge to function...call a GM dealer to get more info on this recall...the heat problem can be easliy fixed at any qualified service station
have vehicle scanned most auto stores offer this service for free the trouble code will give u a start point towards correcting that problem as to the gauge sounds like a different problem from check engine possible connected but doubt it check the wiring up under dash around back of gauge for loose or damaged wire[s] if wires good use a meter and test gauge itself for possible short
Replace the fuel filter first. When you turn the key on, the fuel pump should run for a few moments, then turn off. If it keeps running, then replace the pump as well. Suggest having the fuel system pressure checked at the engine itself. Hope this helps!
The truck needs at least 58 psi of fuel pressure to start ,yet only 48 psi to stay running .Have the fuel pressure check when cold .The problems could be either a leaky fuel pressure regulator or the fuel pump it self .Put a fuel pressure gauge on the fitting under the hood on the fuel lines.Once the truck starts shut it back off to see if the fuel pressure drops off more than 15 psi .If this happens then suspect the regulator if the pressure holds after shutting the truck off than suspect the fuel pump ! ihope this helps :)
the fuel pressure if leaking could cause this the regulator is located under the intake plenum but you should smell gas .if you dont then most likely the pump is bad ,the pump will come on for 2 seconds when the key is on then go off it will not stay on with just the key on only when you crank it will it .so have your fuel pressure checked with a gauge.
Need to check for fuel pressure and volume. If you turn the key on and you have pressure, then you should be able to start and run. If your fuel pressure gauge has a releif hose on it, then while running, dump fuel into a jug and the engine should stay running. If the vehicle will not start but cranks over, then turn the key off and on a few times. the fuel pump will only stay on for a few seconds and cycle off. Sounds like you are losing your fuel prime from the pump to the engine. Only fix is to replace the fuel pump if you are losing your prime.