Heater and air
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Joined: Oct 2000
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From: pleasanton, ca usa
Heater and air
I have a 91RS that i recently bought and the heater and air dont work properly. The guy that i bought it from said you just have to let it run for a few minutes...but thats not the case. When you turn on the heater, or air, you can hear a buzzing sound from the engine like its trying to start up, but never does. Any advice on what to look for, how to fix it? Please help, i need a heater in my car.
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Joined: Mar 2000
Posts: 13,414
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
You mean no air blows out the vents?
Could be two things: Blower motor, or "speed resistors".
Find the blower motor first- that's the thing under the hood that sticks out of the firewall on the passenger side. It'll have two wires going to it; one is off to the side and looks "exposed", the other ends in a tall round "connector". Yank that tall round one off. Run a spare piece of wire from that terminal on the motor to the battery. This gives your motor +12 volts directly.
Make sure you get that center terminal; the other one (off to the side) is a ground! It looks like a piece of metal that's just screwed down on top of the blower motor- don't connect that one to the battery!
Does the motor spin? If not, replace it, about $40 from Pep Boys/Strauss/etc.
If it spins, remove your test wire and reconnect the original wire. Now, check out the speed resistors. They're about 5 inches to the driver's side of the blower motor. You'll see a funny looking connector "plugging in" to something. It should have four wires going to it. Yank it off. Check the terminals that stick "up" for rust/corrosion. Try plugging the connector back in, getting back into the car, and trying your heat. Still nothing? The resisters are probably bad. Turn the car off, go back under the hood, and remove that connector again. Use a 9/32" (or 7mm) socket to remove the two screws holding the resistors in place. Lift the resistors up and out. You can usually get them for free out of a junkyard; and I'm sure GM sells them too. They get "hot" quick; and somehow burn up over years of use.
------------------
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
Could be two things: Blower motor, or "speed resistors".
Find the blower motor first- that's the thing under the hood that sticks out of the firewall on the passenger side. It'll have two wires going to it; one is off to the side and looks "exposed", the other ends in a tall round "connector". Yank that tall round one off. Run a spare piece of wire from that terminal on the motor to the battery. This gives your motor +12 volts directly.
Make sure you get that center terminal; the other one (off to the side) is a ground! It looks like a piece of metal that's just screwed down on top of the blower motor- don't connect that one to the battery!
Does the motor spin? If not, replace it, about $40 from Pep Boys/Strauss/etc.
If it spins, remove your test wire and reconnect the original wire. Now, check out the speed resistors. They're about 5 inches to the driver's side of the blower motor. You'll see a funny looking connector "plugging in" to something. It should have four wires going to it. Yank it off. Check the terminals that stick "up" for rust/corrosion. Try plugging the connector back in, getting back into the car, and trying your heat. Still nothing? The resisters are probably bad. Turn the car off, go back under the hood, and remove that connector again. Use a 9/32" (or 7mm) socket to remove the two screws holding the resistors in place. Lift the resistors up and out. You can usually get them for free out of a junkyard; and I'm sure GM sells them too. They get "hot" quick; and somehow burn up over years of use.
------------------
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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