2001 GMC Safari "hvac controls vacuum line 1997" Questions

...VACUUM LINES UNDER THE HOOD (USUALLY THIN BLACK PLASTIC OR RUBBER) AND WHERE THEY CONNECT TO THE HVAC CONTROLLER IN THE DASH. LISTEN FOR THE LEAK WHILE THE ENGINE IS IDLING. IF NOT, COULD BE DAMPER ...

...controls. The vacuum control system uses vacuum to actuate the vents and ducting from hot to cold. A lot of times the HVAC vacuum line in the engine bay (black hard plastic) is either broken or ...

vacuum problem at the HVAC plenum under the dash. This is a common problem - see YouTube for help diagnosing this: https://www.youtube.com/watch?v=Nlt9A1sp-4U Could be a lack of vacuum . With a vacuum

HVAC) have a flapper that selects if the air coming into the passenger compartment (cabin) is heated or cooled, by allowing either heated air (from the heater core, heated by the coolant in the engine

...HVAC vacuum circuit) or broken door inside the HVAC box. Regarding the air temperature issue, that could be caused by the "blend" system, however I would start diagnosis of that issue under the hood; ...

...HVAC system behind dash...normally this problem will be that the door which controls dash vent circulation will be stuck shut or sometimes the door pivot will wear itself and cause the door to lock ...

...HVAC compartment. This door is either electrically actuated if you have an electronic climate control system, or a cable for manual control. Most probable cause is a failed electric actuator (air mix ...

...hvac, a scan tool would be helpfull. Check for broken, loose or cracked vacuum hoses under the hood. With the engine running, wiggle them all around, and listen for a hissing sound. Make sure the one ...

...1997 toyota 4runner sr5 and the heat in the front quit blowing hot air to the front of the car. but the control in the back still blows hot air there is a blower in front and back and the blower in ...