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Compressor clutch does not engage--100 psi in system-

A/c compressor does not engage,system had 100 psi when gauges installed. thought it just needed r134a but compressor does not run. thanks, brice

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Could be a few things.

1.) High pressure switch- in high side line (smallwe tubing) with a connector on it. Switch may be faulty- but not usually the case.

2.) Improper freon charge- Freon pressure too high- or too low will inhibit compressor from running.

3.) Compressor clutch no good. Check to see if there is power (12volts) at the connector terminals to the compressor when the engine is running and A/C turned on- if there is and the compressor is not running- you have a bad compressor clutch.

Posted on May 30, 2009

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The compressor will not run without a minimum amount of R-134A. In some cases the compressor will shut itself down and require a reset (disconnect neg battery cable for 20min) prior to adding refrigerant. Best of luck with your AC issue.
Greg

Posted on May 30, 2009

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Here is a link that i hope will help you. Keep me posted and be glad to help you but i am on my way out. 
Good luck and hope this helps.http://www.cyberbright.com/autobin/air_conditioning.htm

Posted on May 30, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 01, 2009

    Thank's for getting back to me and i see your A/C still not working, Check the fuse i believe the fuse #37 under the hood which powers up the A/C relay. If the fuse is good then check the relay. If everything else is on working order, try jumping the A/C pressure switch. it's along the low pressure side line or right on the A/C receiver-drier (Accumulators). The switch monitors the amount of pressure in the system which actives the relay to the clutch.


    Keep me informed and how things are going.

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