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GMC Jimmy Climate Control Problems

82 messages,  Last post on Oct 11, 2009 at 6:56 AM

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What is this discussion about? GMC Jimmy, Heating / Cooling, SUV

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#70 of 82 1995 Jimmy climate control problem by goodyguy Sep 30, 2008 (5:23 pm)
Air only comes out through defrost vents no matter where switch is turned. can not get air to come out of the dash or floor vents! Ac works and heater works but will only come out through defrost vents.   Could it be the control unit? or What?   Please help.   Goodyguy~ Replies to this message: smitty36 (Nov 19, 2008 5:50 pm) JManBrody (Dec 06, 2008 5:03 pm) JManBrody (Dec 06, 2008 5:21 pm)
#71 of 82 98 Jimmy by lilly9 Oct 15, 2008 (3:31 pm)
I have a 98 Jimmy and recently had radiator and water pump changed- coold air blows in when going up hills- any ideas??
#72 of 82 Re: 1995 Jimmy climate control problem [goodyguy] by smitty36 Nov 19, 2008 (5:50 pm)
Replying to: goodyguy (Sep 30, 2008 5:23 pm) I have a1998 Jimmy SLE, same problem, no heat or AC from the floor.GM garage told me it was a shutter door and required removal of dash to replace. Repair costs 3 years ago were $800.00. I opte not to have it replaced. Hope this helps. Replies to this message: JManBrody (Dec 06, 2008 5:03 pm) JManBrody (Dec 06, 2008 5:21 pm)
#73 of 82 Re: 1995 Jimmy climate control problem [smitty36] by JManBrody Dec 06, 2008 (5:03 pm)
Replying to: smitty36 (Nov 19, 2008 5:50 pm) I just fixed this problem on my Jimmy. The vacuum line on what I believe is called the vacuum return (little black ball attached to the inner hood, lower right corner) was disconnected. It was very easy to fix, I just looked for a small rubber hose (1/4 " O.D.) that wasn't hooked up to anything and attached it to the nozzle on the little black ball. Now I get hot or cold from any vent I select. Replies to this message: JManBrody (Dec 06, 2008 5:21 pm)
#74 of 82 Re: 1995 Jimmy climate control problem [JManBrody] by JManBrody Dec 06, 2008 (5:21 pm)
Replying to: JManBrody (Dec 06, 2008 5:03 pm) I guess I should have been a little more clear about the problem and the fix. The problem is that there is no vacuum pressure to control the vent selector (its not an electrical control). The fix: typically when this happens it is simply a vacuum line that has disconnected; the problem with these vacuum lines is that they are very easy to remove from the connector nozzles, they're just like the tubing you use for fish tank air pumps. Another reason could be that the vacuum lines are cracked, you should be able to tell by feeling the rubber, if it is not supple and feels hard or brittle it might be time to replace the lines. Should be easy enough, just buy a few yards of vacuum line tubing and replace each line one by one, cutting each to the proper length and reconnect.
#76 of 82 a/c only blows HOT air by c3tucker1 May 03, 2009 (3:06 pm)
So myg/f's 99 jimmy had the heatercore replaced before winter. Now that summer is here the ac seems to have stopped working. The air doesnt blow warm like its outside air, it blows HOT like the heat is on...any ideas?
#77 of 82 HELP! 98 Jimmy only blows HOT air by rdumer Jul 02, 2009 (6:42 am)
I've read everyone's problems and comments on this issue, but I still NEED help! My 98 Jimmy only blows HOT air, not just outside temp air, but HOT air. We did the 'reset' procedure, removed the BAT RDO fuze waited 10 secs, replaced it, put the key in on position and waited >1 mins for the ECC to reset, BUT it didn't fix it. When we push the 'a/c' button on the climate control panel, the light goes on and the compressor under the hood kicks in, AND the lines to/from the compressor at COLD, but the air blowing in the car is HOT.   Originally I took to a 'shop' and they suggested replaced the Climate control panel (I have been trying to located a used one, b/c the new GM ones are $300) but I can't find one, plus reading the posts some people have done this with NO success.   Since the compressor feels COLD, I think there is freon...and the blower buttons seem to be acting correctly (actually the reset 'might' have allowed the blower to respond..not sure at this point if that changed or its just our imagination, hoping the 'reset' did something!)   Should our next step be check the 'doors' in the area beside/behind the glove box? to see if they are stuck?   I read about a potimenter (sp?) is that the same thing as the actuator doors?   This is my daughter's car, limited money, so we don't want to spend a forture on mechanic bills.. ANY SUGGESTIONS ARE APPRECIATED!!!! Replies to this message: rbaumgras (Jul 28, 2009 6:03 pm)
#78 of 82 Re: HELP! 98 Jimmy only blows HOT air [rdumer] by rbaumgras Jul 28, 2009 (6:03 pm)
Replying to: rdumer (Jul 02, 2009 6:42 am) Because the Main Gear in the Blend Motor has cracked and is now not turning the heat/cold door to the Cold position. 3 fixes: Buy a new Blend motor, takes about 5mins to replace. Buy a new Blend Motor Gear, will take about 30mins to fix. Repair current gear with Epoxy, takes about 30mins and 12hrs for the glue to set up strong enough to use it.   http://wiki.answers.com/Q/Why_would_your_98_GMC_Jimmy_blow_hot_air_even_when_the- _temperature_gauge_is_set_to_cold   Hope this helps. Have not checked my Jimmy yet but I have the same problem. Will check it out tomorrow but this sounds like the real fix.

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