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Re: How to fix the air conditioner heater fan in a chevy...
Look under the hood on the passenger side on the fire wall you will see a roung black motor with a 6" flange remove the small screws and the wire harness it's simple
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I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.
I have a Late 1999 Chevy Silverado C1500 Z71. I had one of the heater
hose nozzle snap off this past weekend. I looks like the heater core
hase some kind connection fitting. And I had the same situation!
1.)heater core restricted-check both heater hoses coming from the heater core if one is cold your heater core is restricted and you will need to flush the core.
2.)Your air mix door actuator in the vehicle is inoperative and you will need to replace it.It is located on the bottom of the heater case in the center of the vehicle.It mounts straight up with a couple bolts.
Could be a fuse, but try it all the way on high first. If it works on high only, it's most likely the resistor in the fan control. Hapened to mine a couple of times and Chevy charged me about $150 to fix it.
The fuse is either in the fuse compartment on the side of the dash when the drivers door is open, or under the hood on driver side in a black box. Look on fuse cover it should show what each fuse is for.
none of the above, the vent door is stuck inthe open position most probable cause is vacum leak look closer to your fire wall and you will see a very thin vacum hose going into the vehice which seems to be unpluged!!
you have a reostat that is located in the blower motor housing it will have a 2 wire lead to it it's helld in place by 2 screws this is what regulates the fan speed. this should be replaced ..please rate the solution...thanks
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