69 a/c problem - Team Camaro Tech
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post #1 of 4 (permalink) Old Aug 27th, 99, 05:56 PM Thread Starter
 
Join Date: Aug 1999
Location: Keller, TX
Posts: 2
Lately my factory a/c has been acting up on my 1969 camaro. The blower motor went out early spring and I had it replaced and they also replaced a resistor. After that the air worked great but the high speed setting for some reason would not cool. It worked all summer though on all the other fan speed settings. Nice and cold.

The new problem is that the a/c just stops blowing cold whenever it wants. I'll drive for 10 minutes with it very cold and then it will start blowing warm air. Come out later and it works fine again for a little while. I thought maybe it was low on freon and had it charged. Compressor kicked in, worked great, cooled down to 42. Drove away and then it stopped working again. Off and on when it wants. Any suggestions on where to look for the problem? Could it be the resistor was just faulty and is now affecting all the speeds sometimes? I don't know much about a/c systems but I assume the compressor is fine since it will put out cold air. Any help greatly appreciated.

Deanne
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post #2 of 4 (permalink) Old Aug 31st, 99, 03:27 PM
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Carl
 
Join Date: Apr 1999
Location: La La Land, CA
Posts: 2,707
When the air starts blowing warm, is the compressor still working (clutch engaged)? Visually, the entire front section of the compressor should be rotating if it is engaged. If it does disengage, is there still power to the compressor? Check using a test light on the compressor connector. The fan resistor and relay located on top of the evaporator box are primarily for fan speed control. On the fender side of the evaporator box is a small two-wire temperature switch that shuts off power to the compressor when the temperature in the evaporator box falls below freezing in order to keep the evaporator from icing. You can check this also with a test light. There is a very good diagram for the electrical and vacuum A/C systems in the GM factory assembly manual that may be helpful for your problem as well.

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post #3 of 4 (permalink) Old Aug 31st, 99, 04:56 PM Thread Starter
 
Join Date: Aug 1999
Location: Keller, TX
Posts: 2
Thanks for the reply Carl. When it does start blowing warm air the compressor has stopped working. I can tell because when I stop at a light and try to turn it back on the clutch does not kick in (no change in engine idle, etc.). I do have the 69 manuals and will try looking in there as you suggested and try some tests on it. Would this suggest the temperature switch is faulty perhaps? Thanks.



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post #4 of 4 (permalink) Old Sep 1st, 99, 06:45 PM
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Carl
 
Join Date: Apr 1999
Location: La La Land, CA
Posts: 2,707
That's the only thing I can think of based on the diagram. Mine is a '68 but the only major differences are the compressor location and hose routing. My assembly manual diagram is a little tattered, but from what I can tell the main power line is controlled by a switch located on the temperature control. When this connection is made, it feeds power to the thermostat control switch, which then feeds power to the compressor. How about taking a 12v light bulb, connecting one end to ground and one end to the compressor side of the theromostat control switch. You could easily run a lenght of wire into the passenger compartment and observe if the compressor power shuts off in conjunction with the compressor clutch. I do not know if the GM compressor has an internal means of disconnecting the clutch if the gas (freon or R134)pressure is too high, but that could be a possibility depending on the light bulb test.
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