Question about 1992 GMC Jimmy

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1992 gmc jimmy, no air will come out when vent setting is on and i hear a hissing sound.

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Air door actutator has a vacuum leak or mode switch.

Posted on May 10, 2009

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Posted on Jan 02, 2017

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There is hot air coming out of vents at all times in my 1998 jimmy


Sounds like you have a bad heater door actuator.

May 31, 2014 | 1998 GMC Jimmy

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Depends on what is clicking. The engine vac opens blend doors under the dash. It could be one of the vac pots or a blend door is sticking. Normally the hissing noise means you have a leak, but a leak usually does not fix itself.

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1992 jimmy no air out of top vents


The hoses might be disconnected

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Heater


you have a vacuum leak most likely inside the car if you can hear the hissing sound.check under the passenger side kick panel for the leak.

Nov 28, 2011 | 1994 GMC Jimmy

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96 jimmy is making a bubbling sound in the front under the hood close to wall on the passenger side.


Your coolant level is low, and you hear the coolant taking up the vacant areas....bubbling...due to low coolant.

Jan 24, 2010 | 1996 GMC Jimmy

1 Answer

I hove 1998 jimmy heat works good ,when i change


The switch that controls the defrost, heater and vent settings have gone bad and needs to be replaced. Auto Zone should have that part or you can do the Salvage Yard for around $10.00. The switch that controls the setting has a diaphragm and when it fails, the vacuum from the air lines starts to make the sound you hear and there is not enough pressure to engage vent doors. It take about 20 min to replace from start to finish and your only going to remove two screws from the dash over the instrument panel, the trim panel around the stereo and climate control just clips in place. You don't have to remove the trim panel, it's to much of a pain. the climate control is held on by 4 bolts and the vent setting is held on by one bolt. Once you have the climate control panel unbolted from the dash, disconnect the vent control vacuum lines and then replace the vent control switch. Once replaced, put everything back together in reverse the way you took it apart. Good luck and check that the new vent control works before you put everything back together, just be take caution when you have the engine running to check.

Nov 07, 2009 | 1995 GMC Jimmy

1 Answer

1999 Chevy Suburban - My rear air vents had COLD a/c coming out but my front vents had Cool/Warmer air coming out. I added a can of freon and now it needs more. I can hear a hissing sound near the joint...


The hissing is caused by the freon going through the orifice tube, so do not touch the 2 nuts. You will loose the freon in the system.

What's probably going on is the mode actuator is not functioning correctly.

Take it to a professional, a dealership should be able to help you.

Aug 12, 2009 | 1999 GMC Suburban

1 Answer

1992 GMC Jimmy idles rfast


if this is a throttle body motor which probably is check for vacuum leak were the throttle body bolts on to the intake .the gaskets go bad after awhile .or listen to here a hissing sound try to locate and you might find a vacuum leak there.

Mar 18, 2009 | 1992 GMC Jimmy

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