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Car Forum / Mercedes-Benz Cars / August 2005

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Checking A/C Compressor Pressure

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Bob Lawrence - 02 Aug 2005 12:50 GMT
Can anyone tell me what the high and low side readings should be on a
380sl when the compressor is on and off?

Thanks
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Tiger - 02 Aug 2005 14:48 GMT
R12 Low is around 40PSI when running... about 90 when engine is off.

R134a is lower... 30to35PSI running  and about 70 I think off..
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