A/C problem - Chevy Impala SS Forum
 
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post #1 of 7 (permalink) Old 07-29-2013, 04:08 PM Thread Starter
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A/C problem

I have a 92 roadmaster with electronic climate control , the a/c clutch is not coming on, I tried to jump the pressure switch on the receiver dryer did not make any difference, All the fuses tested good but I did notice that #7 electronic ac control 30amp was hot to the touch but did not look melted, i replaced it anyway, when I apply 12 volts to the green wire on the clutch it engages and the ac works , the pressures are 30/35 low - 200/205 high, any ideas? Is there a relay that powers the clutch somewhere? Or some other pressure switch somewhere ? Do the fuses under the dash have anything to do with it?
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post #2 of 7 (permalink) Old 07-29-2013, 11:27 PM
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Try disconnecting the battery for a minute and reconnect it. Let the climate control cycle and then run it up and down to the maximum and minimum temperatures.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #3 of 7 (permalink) Old 07-30-2013, 03:15 PM Thread Starter
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Thanks Fred, I disconnected both battery bolts and cleaned them reconnected, turned on car, the climate control did some sort of countdown twice and then the ac came right on, I ran the temps up and down the scale and have left it on 60 for about 15 minutes and it is still blowing about 42 degree air right now, that 30 amp fuse still seems a little hot, is this some sign that the ECC is going or do they need to be reset like this every once in a while?
Thanks a lot! Pete M
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post #4 of 7 (permalink) Old 07-30-2013, 07:21 PM
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The socket for the fuse may be a little weakly connected to the wire. My 30 amp fuse would melt the green plastic, and try to take the fuseblock with it. I ended up mounting a remote fuse for the AC. It is really difficult to get to the wiring behind the fuseblock, so if it does not melt the plastic, I would just live with it. The fuse runs the fan.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #5 of 7 (permalink) Old 07-30-2013, 07:33 PM Thread Starter
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Ok that makes sense, what about the ac clutch ? Is having to disconnect the battery mean the ECC is going bad?
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post #6 of 7 (permalink) Old 07-30-2013, 08:17 PM
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Disconnecting the battery is the standard reset for the climate control. It does not infer any problems with the system. If there is a further issue, then you can look for the culprit.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #7 of 7 (permalink) Old 07-31-2013, 04:48 AM Thread Starter
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Cool, thanks again !
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