Jumping the pressure switch, is this correct?

[jmat1980]

To jump the pressure switch for the AC you unplug the connector. On the part you just unplugged you can take a paperclip and touch the two prongs together. This completes the circuit between the two prongs and bypasses the switch on the accumulator.

Is that correct??

Could a bad switch be a cause of a high pressure reading (100psi) from the low pressure port?

Thanks

[Allbert]

As I understand it, the switch just tells the compressor when to come on, which is when the low side pressure is high enough to indicate that the temp of a normal volume of refrigerant is high enough to need to be pumped through the system for more cooling. If the switch is open, your compressor will not cycle and the measured pressure on the low side will be higher than when the compressor is cycling.

[rksnc]

Jumping will by pass the pressure swicth, but this only may help to engage the compressor. It will not work correctly this way because it would freeze up. No the swicth cannot make high pressure on low side. That is the suction side. !00 lbs in what I think you would see if compressor was not enegaged. The pressure swicth turn comp off at around 24 and turns back on around 42lbs. This stop system from freezing up. It will also act as safety device if freon leaks out and pressure to low.