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My car AC compressor clutch does not engage?

mollygomez on Thu September 12, 2013 8:38 AM User is offline

My car does not turn on. The AC compressor clutch does not engage. Only regular air comes in. The pressure on the Low port is a steady 100 PSI. What could it be? Help me out please...

mk378 on Thu September 12, 2013 8:55 AM User is offline

What make / model of car?

Pressure is good enough to satisfy the safety controls, so the compressor should turn on. Its either an electrical problem or the clutch gap.

sgeer on Thu September 12, 2013 5:08 PM User is offline

Can you tell if the compressor clutch is at least attempting to engage? You should see it move, with the sound of (click or clump) after the AC is turned on. Sometimes you can even test this with the engine turned of an the car ignition on. Turn your AC on and you should hear/see the clutch engage.

If the clutch is not engaging first start with your low pressure switch. Make sure, using a voltmeter set on Continuity check, that current is flowing through the switch contacts. If it is not, then you have a bad switch as 100psi is more than enough on the low side to turn the compressor on.

It could also be the compressor clutch electrical relay, as most likely a car computer turns on the clutch using a lower current controlling a higher current through a relay.

Finally, if there is a high pressure switch cut out, this is the only other thing that I can think of that could be causing you the problem.

Home Mechanic

Dougflas on Thu September 12, 2013 8:12 PM User is offline

Make, model, year, & mileage would be a good starting point.

mollygomez on Fri November 22, 2013 4:36 AM User is offline

It is definitely electrical problem in your car's air con according to the situation you are describing. Rest depends on your car's make.

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