AC low side access valve. Overly high pressure
I have a 1998 4.2L F150. I have had it for 8 years and know the AC has never been charged since I have had it and the AC has never really worked. Today I decided to charge it but the reading was way high over 100 psi on the low valve side (in the red danger zone) so did not add anything. I know it was the low side I was checking. Any ideas? Could it have been overcharged for 8 years? what now.
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That pressure sounds okay if the compressor is not running. You need to have a gauge set that reads both the high and low side. Perhaps you should take it to a shop that knows what they are doing?
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yep, the first thing to check is to verify if the compressor is running. Look at the front to see if the clutch is spinning. I'll bet it isn't running.
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Like glc said, take it to a shop that knows A/C.
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If the compressor is running at 100 psi low side, sounds like a bad valve.
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The compressor wasn't running, therefore he was reading static pressure which, for around 90°F would be....drum roll.... a little over 100 psi.
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