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Good luck
Gently turn on the water and watch for crud to come through the drain side. Once it starts flowing freely, let it run until the water coming through is clear.
Put everything back together and get the system flushed and refilled with fresh Dexcool. Do not try to switch to standard antifreez unless the whole cooling system is flushed until the drain water is drinkable! (just kidding, but it needs to be completely flushed) Those two types of antifreeze will not play together, and even a little bit will cause problems.
With a little luck, the corrosion will not have eaten through the heater core.
this will help you find the baffels or doors (3) that control airflow and the parts that control them. Check the hoses at the firewall going in and out of the heater to see if they are hot.
Thank You
Jim
I would appreciate some help on this. Thanks so much.
tidester, host
SUVs and Smart Shopper
Nowadays the AC will kick on when you run the defroster to dehumidify the air, so you shouldn't find anything in your manual about running the AC. And I don't see why never running the AC would hurt anything.
How To Find Your Car Owner's Manual Online
Running the compressor is an issue in any automotive system. It may not be mentioned as most folks will use there defroster/defogger during the winter, and thus run the compressor.
It may not be as big an issue with R134A, but was definitely an R12 issue. Most systems now days use very, very little refrigerant. As an example, the S10 series Blazer/pickup uses less than 28oz of R134A!
Then again, I suppose the manufacturers know that most people trade cars every 3 to 5 years and so they don't mention maintenance for marketing reasons, since many (most?) of us don't want to maintain things. But both my cars are over 10 years old and I just use the AC or defrost as needed, not on some "monthly" schedule.
I felt it was a partially clogged heater core but they replaced the thermostat which seemed to resolve the issue for about 2-3 days.
Any suggestions and should the dealer do the repair free of charge for not fixing it initially?
Good Luck
Jul 21, 2007 (12:50 pm)
I have a 1999 Chevy Blazer with the climate control. The problem is with my heat, it never stops. It constantly blows heat out of the vents. I can still change the direction ( defrost, floor, vents) and the speed of the blower, but cannot shut it off. The AC will not come on, the light comes on, but never any cold air, which I am thinking that it has something to do with this. I am looking for any suggestions please. It is hot outside and is unbearable sometimes to drive. Thank you very much
Any help to share a solution to this posting? Thank you so much
AC Delco 8-2162 (GM-89000993)
16"insert with steel frame.
front
RH and LH wiper.
The have the AC Delco logo faintly printed on each blade to keep your Chevy all GM.
Scott - ASE Master Mechanic
Thanks,
John
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.
Rick
If you have resolved since you posted perhaps you would be willing to share your experience with the rest of us.
Thanks.
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!
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.