Last post on Jan 29, 2013 at 2:06 PM
You are in the Chevrolet Blazer
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Chevrolet, Heating / Cooling, SUV
#145 of 154 Re: Heater fan does not work all the time [hotrodgasket]
Dec 24, 2011 (9:33 am)
I am working through some issues with my '99 Blazer. One thing I do know is the fan won't come on at all until there is hot water (anti-freeze) coming through the heater core. This is a built in function to prevent the system from pumping cold air into the cabin. You say that when it does turn on it works just fine. Perhaps that is the situation you are experiencing. Start your truck and let the engine come up to heat and see if your fan turns on.
#146 of 154 Re: Too much heat! [bear95]
Dec 24, 2011 (9:35 am)
I have the exact same issue with my '99 Blazer. I'm glad to hear there is someone else having this issue. Maybe now we can work on it together to resolve.
If you have resolved since you posted perhaps you would be willing to share your experience with the rest of us.
#148 of 154 Blower will not turn off
Jan 17, 2012 (12:15 pm)
I have a 98 Blazer with Automatic Climate Control, It had started out as a problem of no heat. Then we replaced the Control Module and that gave a little bit of heat being blown, only issue was the blower motor wouldn't turn off until you pulled the fuse.
That lasted for maybe 20 minutes and then blower motor stopped again, this lead to us replacing the blower motor. With this it still will not turn off even with the engine off.
The speed control knob on the dash isn't functioning the way it should, you can turn it all the way to off and still would be blowing full speed.
So I don't know if this would be the issue and would resolve these problems. Just trying to look for some solutions as its pretty cold here and having to pop the hood to take out fuse all the time is less than ideal.
Any help would be greatly appreciated, Thanks!
#149 of 154 Re: 1999 Chevy Blazer Floor Vent Issues [repairdog]
Jan 17, 2012 (2:05 pm)
My actuators look to be all working, just no air comes out on the floor. when you select the floor the air comes out defrost area.
#150 of 154 Re: 1999 Chevy Blazer Floor Vent Issues [geno69]
Feb 10, 2012 (9:24 pm)
Oh, I have seen this one before, several times. The vacuum line that runs from the intake manifold to the vacuum resevoir in the drivers side front fender is rotted/leaking. It runs from the drivers side (left bank) of the intake manifold on the engine to a "tee" near the power brake vacuum booster. Check all the hoses and replace them if rotten. Actually, just replace them all because if some are bad, all will be close to bad.
In the case of a vacuum loss, the directional damper will not move correctly.
Will cost about $3 in vacuum line and takes about 15 minutes.
#151 of 154 Auto Climate control Trouble
Feb 18, 2012 (9:35 am)
I have a 99 Blazer with the auto climate control. About a month ago the blower motor would come on sometimes and sometimes it wouldn't. Seems like in the morning when it was cold it wouldn't come on but in the evening when it was warm it would. When it would come on everything would work great. It finally got to where it wouldn't come on at all so I wired it to the battery and ran a switch in the cab so I could just turn it on and off so I wouldn't freeze. When I flip the switch for the blower it blows strong but no matter what I turn the temperature to it blows hot air and cold air. What I mean is, it will blow extremely hot air for about 5 seconds then it will blow cold air for about 5 seconds. I can hear something in the dash making a clicking and whining noise now. I didn't notice this until I wired the blower to the battery. Before I wired the blower straight to the battery, I measured the voltage at the plug that plugs into the module. I've got 12 volts between the orange and black wire and 12 volts between the black/white and black wire. I also measured the purple and black wires that come out of the module and go into the blower motor. I've only got .0443 volts at those wires. I got another module out of a junk yard and it gives the same measurements so I don't know if I've got two bad modules or this just isn't my problem. Any help would be greatly appreciated because I am stumped.
Jan 25, 2013 (5:56 am)
I have a 1998 Chevy Blazer ST-10. Recently, the fan decided it was only going to come on sometimes. It will come on when it's freezing cold outside. I've pulled fuses reset the computer by disconnecting the battery. The heat is on, but the fan will not kick on. It doesn't matter if it's on A/C, defrost, or heat. As well, when it does decide to come on, it will not blow on the floor. We're in the middle of a winter storm right now in Northern Michigan, and I'd really like to have my heat back without paying an arm and a leg.
#154 of 154 Re: 1999 Chevy Blazer Floor Vent Issues [rev7]
Jan 29, 2013 (2:06 pm)
hi ive been working on tis right now found out there is a line that goes into the fender..see if that has fallen off..its very small and u need a mirror to see it,when that's off it defaults to defrost and vents only.