- #2 of 118
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Re: 99 Blazer blowing constant hot air [ssabie]
by repairdog
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Dec 11, 2006 (3:13 am)
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Replying to: ssabie (Dec 10, 2006 8:29 pm)
Is this an LT with auto temp (temps marked on dials and auto positions)? If so theres an electric blend motor that can fail and the noise is it searching around for temp. Rotate the dails a bunch of times and hope its buildup crap on them and they clean off, if not plastic gear maybe stripped - use the dealer for this small shops do not understand this one and charge tons while dealer sees them alot. If standard controls check the vac line under hood drivers side that ends in a plastic line that runs to the control head under dash but of thats bad default is defrost.
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- #3 of 118
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Re: 99 Blazer blowing constant hot air [repairdog]
by ssabie
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Dec 12, 2006 (6:18 am)
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Replying to: repairdog (Dec 11, 2006 3:13 am)
Yes, this is a LT. Will try your advice this evening. Thank your very much for your time and assistance. Will post results.
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- #4 of 118
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Re: 99 Blazer blowing constant hot air [repairdog]
by bigbear3
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Dec 17, 2006 (10:11 am)
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Replying to: repairdog (Dec 11, 2006 3:13 am)
I also have an LT which does the same thing but if I turn the dial all the way to cold and the fan all the way up it finally kicks cold air out. When I run the heater it is fine but when I turn everything off it still kicks hot air out. Although I do not have the clicking or popping noise it still will not stop when I turn the heat off. I occasionally here a water sound like coolant is still coming into the heater core. Do you think it is similar to SSABIE? thanks in advance.
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- #5 of 118
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Re: 99 Blazer blowing constant hot air [bigbear3]
by repairdog
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Dec 19, 2006 (3:15 am)
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Replying to: bigbear3 (Dec 17, 2006 10:11 am)
Yes, and you also have a partially clogged heater core with the classic noise - air in the system can also make the noise so check that the lower intake gasket is not leaking.
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- #6 of 118
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99 LT blazer
by jtrip
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Mar 22, 2007 (4:21 pm)
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Air went cold then hot a couple of times then stayed on hot,
replaced actuator because it was clicking and new climate control but did not work.
I talked to dealer and they said they haven't heard of this which I don't believe,if anyone can help Id appreciate it.
hot air unless I manually turn the door to cold.
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- #7 of 118
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Re: 99 LT blazer [jtrip]
by repairdog
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Mar 24, 2007 (1:30 pm)
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Replying to: jtrip (Mar 22, 2007 4:21 pm)
If Auto climate control you have an electric blend door motor also that often fails. Constant cycling of hot to cold. A simply replacement of a $200 part thru the glove box.
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- #8 of 118
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Re: 99 LT blazer [jtrip]
by carprobs
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Apr 12, 2007 (4:20 pm)
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Replying to: jtrip (Mar 22, 2007 4:21 pm)
I have the exact same problem on my 99 Blazer LT. I discoverd it last fall when I had the AC on and all of the sudden, it would switch over to extreme heat. Then, I realized in the winter when I had heat on, the opposite would happen (AC would kick on). The heat even comes out when I have the fan turned to "OFF." Took it to the GM dealer SIX times last year for the same problem each time and the problem is still ocurring. They replaced the control panel and fan motor. They also said they never heard of the problem and that the system was designed to run on the "auto" function---I told them that I've always used the "manual" settings and never had a problem all these years until now. I even contacted the corporate GM office and they were of no help. If anyone found the fix, please share. It becomes quite concerning in inclimate weather when I go to turn on the defrost and it blows out cold air using the A/C.....
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- #9 of 118
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Re: 99 LT blazer [carprobs]
by repairdog
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Apr 13, 2007 (3:22 am)
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Replying to: carprobs (Apr 12, 2007 4:20 pm)
Post above tells you the common answer. Maybe find another dealer or ask them about the electric blend motor that controls a second blend door on auto climate control LT models - I have a 99 and mine went out and common and it cycles between hot cold even in manual settings. Motor has a cheap plastic gear that breaks.
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- #10 of 118
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95 Jimmy blowing hot air when AC turned on
by mitch16
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Aug 15, 2007 (9:05 am)
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My AC only blows hot air. I don't have a automatic climate control system. It's just the standard round dials that you turn for hot or cold. Do I just need new refrigerant?
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