Questions & Answers for: GMC Sierra no heat idle

...heat and AC is not working. I have checked the fuses all seem fine same...mine is on GMC Savannah...started when fan would cut out for no reason...idle no car movement, would randomly cut out for 6 ...

...heat up at an idle No diesel I have ever owned will heat up to operating temp while idling. I have had semi's and dump truck and a Dodge with a Cummings turbo diesel. If you don't idle a diesel up to ...

idle. Do the same starting from the brake booster unit (the round unit) on the drive side fire all. Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

...door actuator or autuators. start there. As JohnJohn2 said it is more than likely the blend door actuator or as simple as a bad vacuum line. Does the engine idle seem rougher since the heat

idle/2000RPM? At highway speed, heater floor vent is only 96 degrees at max heat/fan speed. Air lock? What is the problem/solution? two things--first replace your cabin air filter.second reverse flush

...low idle emissions failure? Any suggestions would be greatly appreciated. Catalytic converter. It heats up and burns off unburned fuel, if it's original, it's probably worn out. Cheap ones are not ...

MY 2000, GMC SIERRA SLT IS OVER HEATING. I THINK I HAVE IT NARROWED DOWN TO NOT HAVING THE CORRECT ANTIFREEZE MIXTURE. THE THERMOSTAT OPENS WHEN IT REACHES NORMAL TEMPERATURE & AT IDLE STAYS IN ...

...heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. What could the problem be? It sounds like the engines thermostat is stuck open, when ...

heat now.. i rev the motor to around 2500 rpm and it gets hotter. let it back down to an idle and its not so warm. one hose going into heater core is hot but one coming out is just warm I had a 91 GMC

color probably head gasket.is the engine noisy or fan. if fan? it is locking up because of the high heat from rad.normal. if engine possible coolant in the oil