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Low pressure cut off switch

lehyumaz on Thu August 20, 2009 9:50 AM User is offline

Year: 1994
Make: Dodge
Model: Intrepid
Engine Size: 3.5L
Refrigerant Type: R134A
Ambient Temp: 85
Pressure Low: 75
Pressure High: 75
Country of Origin: United States

Compressor clutch not engaging. Is there a way to bypass the low-pressure switch during fault isolation & manually engage the clutch. All components are original OEM.

lee henderson

Chick on Thu August 20, 2009 10:08 AM User is offlineView users profile

Your car uses a three wire pressure transducer, located on the high side line. They cannot be jumped as the only receives a 5v reference signal from the computer.. You can fry the computer if you try jumping them. You can test the compressor by jumping the relay, but it's most likely gonna be the transducer...seen a few control heads go bad also.. And of course the relay itself...

Email: Chick


Freedoms just another word for nothing left to lose

GM Tech on Thu August 20, 2009 10:22 AM User is offline

number one failure mode in mobile a/c systems is loss of refrigerant due to a leak- put a set of gages on it-- see what pressure is-- if too low, or near zero- that is your problem. the system is trying to protect the compressor- by not running without refrigerant in it.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

NickD on Thu August 20, 2009 11:28 AM User is offline

If you are showing static pressures of 75 psi at 85*F when they should be at 95 psi, your system is all but bone dry. Take GMtechs advice.

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