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Posted by chris (more from chris) on Tue, 14 Jun 2005 21:13:34 Share Post by Email
In Reply to: A/C compressor clutch question, Dave B 89 900s Auto, Tue, 14 Jun 2005 19:48:29
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To test the A/C compressor:

1. Turn the ignition on and turn the tempurature regulating knob to its full cold position. Turn the A/C switch on and listen for the compressor clutch to click on.If no click is heard, the compressor clutch may not be receiving voltage or the clutch itself may be faulty.

2. Check for voltage between the single-wire connector leading out of the compressor and ground. If voltage is present, the compressor clutch is faulty and should be replaced.

3. If voltage is not present, check for a faulty compressor fuse in the main fuse/relay panel. Check the A/C coolant tempurature switch, the low pressure switch, and the anti-frost switch. The anti frost switch can be checked by diconnecting the switch connector and connecting an ohmmeter across the switch terminals. There should be continuity with the switch at room tempurature. If not, the switch is faulty and should be replaced.

Also, there is an A/C diode in the wiring harness at the rear of the camshaft cover. Ya might wanna check that. Use an ohmmeter on it and if it reads "open" then it is faulty.

Who knows, could even be the A/C switch itself, have you checked that too?

posted by 68.112.7...

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