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#1
10-25-2006, 09:13 AM
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99 AC/Heat
On my 99 blazer one day the heat and ac worked fine.Next day nothing works,Recirc,fresh,fan speed,rear defrost or automatic modes.Compressor is cycling as if ac is on .Anyone know thw problem.
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#2
10-25-2006, 10:46 AM
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Re: 99 AC/Heat
Do you hear the blower motor come on at all?
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#3
10-25-2006, 11:48 AM
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Re: 99 AC/Heat
No you hear nothing.I have checked all fuses and all are good.I work on my old classics but this is baffling.Nothing on that panel works including rear window defrost.
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#4
10-25-2006, 12:45 PM
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Re: 99 AC/Heat
It could be a loose power connection going to the blower motor, or a bad blower motor relay, or the blower motor just took a dump.
Try running a jumper ground wire from the screws on the blower itself to a good ground under the hood, that was a coworker's problem on his 97'
__________________
1998 BLAZER LS Vin-W 4Dr 2wd 2004 Cavalier LS 4Dr 2.2 Ecotec "Good Part's ain't Cheap--Cheap Parts ain't Good" 
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#5
10-26-2006, 08:14 AM
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Re: 99 AC/Heat
Quote:
I had a similar issue with my power windows. It turned out that I had a couple of harness that were undone and the wires were rubbing on mounting brackets for the dash. This caused a bunch of shorts and burnt wires. Once I got all that cleaned up all the electrical ghosts went away.
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#6
10-26-2006, 12:44 PM
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Re: 99 AC/Heat
sounds like a control panel problem.
A bad power connection, or a vacuum leak. Defrost will have the compressor cycling.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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#7
10-27-2006, 07:16 AM
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Re: 99 AC/Heat
I don't believe it would be a vacumm problem.This Blazer has the optional automatic controls.Even the button for rear window defrost doesn't work and that has nothing to do with vacumm.Also the compressor is cycling with the selector switch in the off position.I am guessing electrical in some shape or form.
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#8
10-27-2006, 02:40 PM
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Re: 99 AC/Heat
Quote:
They can be purchased off of ebay cheaply.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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