1999 Explorer XLT AC compressor clutch

[hueycrew]

My AC clutch was making a scraping (slipping noise) when engaged. Watch the operation and found the hub was spinning in a elliptical motion.

One of the bonding straps on the hub was broken. Compressor spins freely.

I replaced the hub (OEM part), cleaned all surfaces, set the gap to .030. Bolt is torqued

Clutch now engages perfectly and my AC blows cold however, When I rev the engine to 2800-3000 rpm it starts slipping (some sparks fly from the hub).

Any ideas on why it slips at high RPM?

 

[C420sailor]

Did you replace the entire clutch assy?

 

[FordFlintrock]

Could be not getting the full 12 volts to clutch. Could be the magnet coil is weak where the 12V goes.

 

[hueycrew]

Did you replace the entire clutch assy?

No just the hub

 

[hueycrew]

Could be not getting the full 12 volts to clutch. Could be the magnet coil is weak where the 12V goes.

12 Volts to the coil and passed resistance test.

 

[FordFlintrock]

Well then could be the compressor is getting slugged with liquid offering greater resistance to turn.

 

[C420sailor]

Only way to know for sure would be to hook up gauges and see what they tell you when the clutch kicks on.