- #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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- #12 of 118
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1996 LS Blazer
by stobar
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Dec 19, 2006 (7:24 pm)
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it is blowing blows cold aire and the temperature gauge keeps going up and down. what the heck is going on?
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- #13 of 118
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Re: 1996 LS Blazer [stobar]
by repairdog
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Dec 22, 2006 (3:08 am)
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Replying to: stobar (Dec 19, 2006 7:24 pm)
Thermostat probably bad. Time for a radiator flush, new thermostat and Stant cap. Is the fan clutch OK (sounds like a jet if stuck on).
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- #14 of 118
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Heater Issues
by mksweet80
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Jan 28, 2007 (6:48 pm)
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I have a 94 S10 Blazer and it stopped throwing heat replaced the control panel assembly (used) and just replaced the heater blower motor the motor engages and runs but still not blowing like it should..the only time you can feel some of the heat coming in is from the force of the air going down the road..no idea what to do HELP ANYONE!
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- #15 of 118
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Re: Heater Issues [mksweet80]
by repairdog
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Jan 29, 2007 (2:31 am)
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Replying to: mksweet80 (Jan 28, 2007 6:48 pm)
Heater core could be clogged (flush it), the resistor that runs the fan speed could be bad (believe up on underhood housing so check it replace if necessary), or the control door (heat vs air etc) not moving so check that and the vac lines underhood drivers side - if defrost only thats default for no vac - look behind glove box for the door vac switch. This all assumes engine temp running at normal 195 so good thermostat.
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