Question about GMC Envoy
...heater control, or the vacuum line developed a leak somewhere between an actuator and the heater control or the engine. You can try to pin down by checking airflow out of the defroster, ac and heater ...
...like a vacuum problem. Do you have a seemingly hard brake pedal? If you do chances are your brake booster is leaking vacuum. If not check your vacuum lines. Your heater system is controlled by
...will not switch from the defrost to the floor on a 2004 envoy MODE ACTUATOR sounds like a vacuum leak from the engine to the heater controls. Can you hear a ssssss noise while the engine is
...heater fuse it can also cause the blower motor not to work. I hope this helps you out. If you have any questions please feel free to ask BLOWER MOTOR Might be the Resistor pack located close to the ...
Question about Cars & Trucks
...vacuum TO the ac/heater climate control switch in the dash? Have been looking for a vacuum leak. Found one in the engine compartment at the throttle body but no others in the engine bay. Van still ...
...Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected. Drain engine coolant. Remove instrument panel. For 5.4L (4V), if quipped, remove junction ...
heater will roast you at up to 120 degrees. However, when I drive they will both go in and out. They will only put out warm air. It seems like it changes when I come to a stop. They both go out at the
...is blowing, I would guess an issue with your heater control module or a vacuum problem of not supplying vacuum to move the plenum door. Hope that helps. not a vacume leak properly a heater core ...
Question about Cars & Trucks
...or to the defroster. A leak in the tubing, ball, or motor can cause the door(s) to retract to default if vacuum drops down as it does at idle. Have the heater box and vacuum system to it checked
Question about GMC Envoy
...vacuum leak in the heater controls. When you select heat, vacuum is directed to a vacuum motor. This motor operates a vacuum actuator that moves a linkage that moves a door inside the heater box to ...
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