Quote:
Originally Posted by David.X5
It's just a guess, but I suspect your compressor didn't turn on and you are measuring the static pressure in the system. This makes more sense if the engine/compressor was more (say around 90 F). You have to find a way to force it on or troubleshoot that problem first.
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I remember reading on the booklet that came with the gauge that if the compressor does not turn on then fill half a can of refrigerant. Something about that did not feel right so I didn't do it. Maybe I'll first try driving the car around a bit till the ac starts blowing cold air and then verify pressure.