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Slipping a/c clutch on 2000 Explorer

Upright on Tue July 01, 2008 3:42 PM User is offline

Year: 2000
Make: Ford
Model: Explorer
Refrigerant Type: R-134A
Ambient Temp: 85 F
Pressure Low: 40
Pressure High: 220
Country of Origin: United States

When I turn on the a/c on my 2000 Ford Explorer, the clutch on the compressor will slip 2-3 times for about a second each time, creating a groaning noise that sounds like Chewbacca from Star Wars. After that, the clutch seems to lock up and the slipping stops. The pressures are 40 low and 220 high, with a center vent temp of 55 F and an ambient temp of 85 F.

Is a compressor failure imminent, or is the clutch going bad? Or something else?

Thanks,
Craig

TRB on Tue July 01, 2008 10:36 PM User is offlineView users profile

Anytime a compressor is locking up its not a good sign. Pressures look OK so its not an high pressure issue. No noise when pulley is running freely? If so good chance the compressor has seen better days. If it were in my shop I would inject an once of oil and see if it helps with the noise.

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Upright on Wed July 02, 2008 12:15 AM User is offline

Thanks for the reply, Tim. It seems to be okay when the compressor isn't engaged, but I haven't tried pulling the belt and spinning the pulley by hand. The noise is definitely from the slippage of the clutch. When the clutch slips, it immediately disengages. It then re-engages a few seconds later. This usually happens three times, then operates as normal. (With the exception of the temp not as cold as I'd like.)

Upright on Wed July 02, 2008 10:15 AM User is offline

How would I inject oil into the system? And what viscosity?

Thanks,
Craig

Edited: Wed July 02, 2008 at 10:17 AM by Upright

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