Question about 1998 Nissan Frontier
When I turn off my AC system or when it cycles, I hear a noise that sounds like a bad bearing slowing down. My mechanic says when the system is turned off the AC clutch turns backward. Is there a check valve in the high pressure line that could not be closed?
Go to the parts store and buy (for about $10) a mechanics stethescope. It will have a metal piece you can carefully (MAKE SURE YOU DON"T PUT IN THE PATH OF A MOVING BELT OR FAN) put on the top of the A/C compressor, other end in your ears, and with a helper turning the A/C on and OFF, you should be able to determine if the sound is coming from the A/C compressor clutch. If so, replace the compress clutch or compressor. Form the limited info I have, it sounds like the clutch is bad or on the way out.
If the A/C works (blows cooler than the ambient air), it's unlikely there is any problem with valves in high or low pressure side being in wrong position (especially if no one has been monkeying with them ;~) )
Posted on Nov 05, 2008
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Posted on Jan 02, 2017
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