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Low charge or pressure switch? 700

posted by  87V780 on  Sat Oct 25 06:10 CST 2003
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Well, I finally got a the climate control to send a +12 V source to the A/C pressure switch, but that's where it stops, the pump does run though when the lug is jumpered. So, my next question in this project is how do you determine if the pressure switch is bad, or if the system is low on charge? Thanks in advance.








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Low charge or pressure switch? 700

posted by  mcduck on  Sat Oct 25 07:45 CST 2003
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last visit: Sun Sep 9 11:47 CST 2012
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Measure the pressure at the accumulator; if it's below ~35 psi the compressor won't run.
--
Jim McDonald








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Changing the switch 700

posted by  87V780 on  Sat Oct 25 11:01 CST 2003
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Will the system vent freon if the pressure switch is removed, or is it isolated in some way?








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Changing the switch 700

posted by  someone claiming to be sumpmnu on  Sat Oct 25 15:51 CST 2003 [RELATED]

There is a shraeder valve under it. You can unscrew it and replace it without doing anything else. Replace th O-ring also. It does not come with the pressostat. These do fail pretty often and they cost $35-40. I think the number someone gave is right for the switch to be closed. If you have a gauge, check the static system pressure. If it's too low, the switch may be OK.







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