A/C Clutch coil

Asked by alanrb Jun 14, 2013 at 11:38 PM about the 2004 Toyota Matrix FWD

Question type: Maintenance & Repair

The A/C has quite on my Matrix. The garage says I need a new pump. The pressure is fine. I checked it out myself and the clutch is not engaging. There is power to the clutch 16 volts. I also jumped from the batter to the clutch coil to see if it would engage and it didn't. I have yet to test the ohms at the coil, but assuming that the coil is bad what are the chances that the coil just failed on it's own, or is it more likely a symptom of an over heating pump or something else. I would love to just replace the coil, or even just the clutch, but not to have it fail again. I did find that the coil was not grounded due to corrosion, but I cleaned up the contact to the pump housing, but it didn't fix the coil function.
thanks in advance

4 Answers

alanrb answered 10 years ago

The reading of 16 volts was coming out of the harness that attaches to the coil with the engine running. I can turn the pump by hand. Where is the voltage to the coil controlled? thanks so much for your reply.

Mark helpful

alanrb answered 10 years ago

I am getting about 15.46 volts at the battery (car running) and the same at the a/c clutch harness, but I don't know if my meter is calibrated. I get no reading when I check the ohms at the coil. thanks

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alanrb answered 10 years ago

So I ran a few voltage checks. I am not getting about 15.29 with everything running (heater,blower,lights) It stays about the same at 2000 rpm. For some reason when I just let the car idle the voltage at the batter would slowly climb, it got up to about 15.49.

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