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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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#67 of 82 Re: Jimmy 2000 Heater Blower Not Working [repairdog] by johnpaulten Jul 22, 2007 (11:39 am)
Replying to: repairdog (Mar 03, 2007 5:51 pm) any idea when fan motor(a/c) wont stop running even when ignition is off/ 2003 avalanche
#68 of 82 Heater Blowing Cold Air by jflo520 Nov 07, 2007 (6:27 am)
I have a 98 Jimmy and sometimes the heater will blow only cold air. It was working fine last night, but when I used it this morning the air was cold while I was idling. It warmed up once I got going, but started blowing cold again after about 10 minutes. Can anyone give me an idea what might be causing this? Replies to this message: jarett (Nov 19, 2007 6:02 am)
#69 of 82 Re: Heater Blowing Cold Air [jflo520] by jarett Nov 19, 2007 (6:02 am)
Replying to: jflo520 (Nov 07, 2007 6:27 am) jflo520,   I also have a 98 Jimmy with the exact same problem. It has been like this for 3 winters and no one has been able to explain, or fix, the problem. Can you please copy me if you find out how to correct this. Thanks.
#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?

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