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Old 12-31-2007, 11:20 AM
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Heater/AC

On my '84 Camaro, when I bought the car, the previous owner had taken the AC out and hacked of the compressor. When I turn the controls on inside for the heater or defrost, I get nothing. Is the heater and defrost somehow connected with the AC system? If not, what could be the cause of this? I'm really not concerned with the AC for right now since I'm in Europe, but I gotta have the heat and defrost.

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Old 12-31-2007, 05:29 PM
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Heater/AC

did he cut the ac coil line and hook the heater hose to it ?
this is a old trick for heat with out replacing the heater coil .
you have to run on ac with the heat selector on cold .
if you do have the hoses connected the right way , check for vacuum at heater controls .
look for pencils and other things in duck work jamming the directional doors from opening or closing .
rat nest maybe ?
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Old 01-02-2008, 08:09 AM
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Im not sure what he did. But I'll go take a look at it. Are there any other possible scenarios?
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Old 01-02-2008, 05:56 PM
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Quote:
Originally Posted by Chevy 84
On my '84 Camaro, when I bought the car, the previous owner had taken the AC out and hacked of the compressor. When I turn the controls on inside for the heater or defrost, I get nothing. Is the heater and defrost somehow connected with the AC system? If not, what could be the cause of this? I'm really not concerned with the AC for right now since I'm in Europe, but I gotta have the heat and defrost.
Depends on how hacked up the car is. The heater system used with A/C differs from the heater in non-A/C cars. On A/C cars, the flapper doors inside the air distribution box are opened and closed with vacuum servos. If the vac hoses have been disconnected or misrouted, the heat and defrost won't work. Also, on A/C cars there is a heater valve that controls water flow into the heater. Again, without the vac hosed connected correctly, this won't work either.

You didn't say what doesn't work. Does the fan motor run? If not, the wiring is disconnected or misrouted also.

Bottom line is that the heater and A/C are interrelated and you can't just hack one out without doing some things to keep the other working.
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Old 01-02-2008, 05:58 PM
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Quote:
Originally Posted by burnt olds
did he cut the ac coil line and hook the heater hose to it ?
this is a old trick for heat with out replacing the heater coil .
you have to run on ac with the heat selector on cold .
I guess I don't understand this. The A/C ducting already has a separate heater core in it. You can remove the A/C evaporator completely and the heater core is still there and still works.
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Old 01-03-2008, 12:06 AM
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I'm sorry about not explaining better. The blower is blowing or anything. Nothing. So maybe you're right about some wires being crossed or mis-wired. I liked in a Haynes repair manual and it does'nt go into too much detail about the heater. I'm going to take a look at it tomorrow and say what I can find. Thanks for the input.
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Old 01-03-2008, 11:32 AM
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Quote:
Originally Posted by Chevy 84
I'm sorry about not explaining better. The blower is blowing or anything. Nothing.
Did you mean the blower is NOT blowing? First thing to check is the fuse. Next, verify that the ground wire from the blower motor is in place. If still nothing, run a +12V wire directly to the motor hot terminal and see if it runs. If not, you need a motor. If it does, continue backwards. Check the relay, motor resistor, and switch. Also, are the heater hoses connected? If the heater hoses are carrying hot water and the fan turns, you will get some heat. Most GM systems have a default mode that opens the heat and defroster doors in the air box if there is no vac signal.
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