Quote:
Originally Posted by LarryBible
I would start by checking pressures and making sure that you have a correct charge. You can then determine correct pressure switch pressures and check the switches while gauges are connected.
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Unless the car has been modified, the only pressure switch involved is the low pressure cut-off switch. How likely is it that the high pressure side pressure would decrease while the compressor was operating?
However, if the car has been converted to R-134a and a dual acting pressure switch was installed, the described condition could easily be related to the refrigerant level.