- #1 of 82
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Problem with my climate control in my 98 Jimmy
by breeden
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Dec 08, 2006 (7:23 pm)
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Something is very wrong with my 98 Jimmy's climate control. It keeps going back and forth between hot and cold and it sounds like it is changing back and forth between recirculating and bringing in fresh air. Even when I turn the dial to off, it continues to make the sound like it is switching back and forth. Anybody have any ideas?
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- #2 of 82
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Re: Problem with my climate control in my 98 Jimmy [breeden]
by repairdog
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Dec 09, 2006 (3:53 am)
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Replying to: breeden (Dec 08, 2006 7:23 pm)
If the auto climate system with temps on the dials then you have an additional electric blend motor that swings the heat air door to maintain the temp and it has a plastic gear that can get stripped and if your battery died recently can get lost or not know where it is so searches. Dealer can reprogram or replace and I suggest them as most other shops have not done these and it actually runs much more.
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- #3 of 82
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Re: Problem with my climate control in my 98 Jimmy [repairdog]
by breeden
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Dec 09, 2006 (11:40 am)
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Replying to: repairdog (Dec 09, 2006 3:53 am)
Yeah, one of the battery terminals had worked lose just before it started happening. Thanks a bunch
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- #4 of 82
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No Heat And Overheating
by moldyg
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Apr 15, 2007 (3:27 pm)
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- #5 of 82
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No Heat And Overheating
by moldyg
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Mar 27, 2007 (3:46 pm)
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Hi there, i have a 2000 gmc jimmy and my heat stopped working the other day and now it seems my truck seems to be running hotter then normal. And ive been hearing this gurguling noise coming from the passenger side? just wondering if its my heater core or something else? thanks fo your help
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- #6 of 82
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Re: No Heat And Overheating [moldyg]
by jlflemmons
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Mar 27, 2007 (5:23 pm)
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Replying to: moldyg (Mar 27, 2007 3:46 pm)
How many miles on the Jimmy, and have you ever had the coolant replaced? The gurgling you hear is coming from the heater core. There is air in the cooling system and that will cause the engine to overheat.
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- #7 of 82
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Re: No Heat And Overheating [jlflemmons]
by moldyg
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Mar 27, 2007 (9:40 pm)
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Replying to: jlflemmons (Mar 27, 2007 5:23 pm)
i have about 115,000 kms on it. Since ive owned it its never had the fluid replaced...ive owned it for 3 or 4 year
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- #8 of 82
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Re: No Heat And Overheating [moldyg]
by repairdog
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Mar 28, 2007 (1:45 am)
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Replying to: moldyg (Mar 27, 2007 9:40 pm)
You have a clogged heater core with the sound and lack of heat OR you are very low on coolant. Dex cool becomes sludge and if not maintained actually eats the core and radiator, clogs the factory cap, and the thermostat. Get that system completely flushed and refilled changing the cap and thermostat. I would first check the system for leaks with a free use pressure tester and see if after you pump it up to 16 lbs it drops and where. 4.3 is known to get lower intake gasket leaks by 100k miles so look carefully along the lower intake to block mating surface, at the water pump, and listen for the heater core hissing with the pressure test. Again - change that Dex cool every 3 years/50,000 miles at least - don't you wonder why the GM warranty expired at 3/36!
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- #9 of 82
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Re: No Heat And Overheating [repairdog]
by gin6
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Mar 28, 2007 (5:58 am)
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Replying to: repairdog (Mar 28, 2007 1:45 am)
This is my first post,Son has a 1999 Blazer that I bought used 2 yrs ago.After 1 mo.had the radiator flushed twice,I kept getting that overheating smell,but the shop said it was fine.My question is,Why keep useing the Dex Cool if it keeps cloging the radiator and causing slug?I know that there is green,orange&yellow coolant on the market(Very confusing for us 50+ hotrodders).Can we use another brand? Blazer finally quit on my son so we are now tearing into the engine,( head gasket has lrg. split and corrosion between cylinder)and I am having the heads checked for cracks.When we put it back together what coolant is best? Thanks for your input.
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- #10 of 82
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Re: No Heat And Overheating [repairdog]
by moldyg
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Mar 28, 2007 (8:34 am)
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Replying to: repairdog (Mar 28, 2007 1:45 am)
thanks for your help...i try the rad flush
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