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Thread: AC not working on High Setting
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06-16-2011 #1
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- Nov 2010
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AC not working on High Setting
I have also have a 77 TA that has factory AC and i just replaced the AC Blower Resistor and now for some reason the air blows cool and decent on the medium setting but when i switch it to high the air doesnt blow at all...anybody know whats up these and is it just an easy adjustment or fix??
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06-18-2011 #2
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On my 70 chevelle the high speed has its own fuse. It is under the hood by the ac box.
06-18-2011 #3
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- Sep 2008
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- California
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On High there is a relay the switches the connection to a direct wire that is attached to the alternator. It may have a Fuse or fusible link check that as mentioned.
That wire should be red and will go from your alt to the relay then out of the relay I think the brown wire powers the fan.. I went through this on my 75 Formula. In My case, the relay was bad, then I burned a new one installing it and testing it. It could be faulty/burned out on yours. There are 4 and 5 pin versions of that relay depending on the harness plug you have. Rockauto.com has them for under $10.00 each RY22. I bought a few. Also check the resistor to be sure that the wires are not broken.
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