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Blown/melted high pressure switch on back of compressor

Snowmover on Mon September 19, 2011 12:59 PM User is offline

Year: 2002
Make: Chevy
Model: Tahoe
Engine Size: 5.3
Refrigerant Type: R-134
Country of Origin: United States

Hello,

I'm working on a 2002 Tahoe that had the high pressure switch blown off the back of the compressor. It came apart at the crimped metal ring discharging the refrigerant. The Tahoe has 150k miles on it. There was some clutch noise noted but after pulling the compressor the innards are intact. The orifice tube has a very small amount of debris on it. I put some air pressure to the condenser to make sure it was not plugged.

The plan is to replace the compressor and orifice tube, purge the system with nitrogen, evacuate and recharge.

I wondering why the switch blew?

Also, what visc. and how much oil does this system take? it has rear a/c. One thing I forgot to order!

Thanks

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Edited: Mon September 19, 2011 at 10:14 PM by Snowmover

Airstream on Tue September 20, 2011 12:41 PM User is offlineView users profile

Quote
Originally posted by: Snowmover

I wondering why the switch blew?
If the switch's electrical connector's wiring was not secured well, I would suspect vibration fatigued the metal until it failed.

Tom

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