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will not take charge no readings

jack31ca on Fri May 29, 2009 4:26 PM User is offline

Year: 1988
Make: dodge
Model: caravan
Engine Size: 3L
Refrigerant Type: 134-a
Ambient Temp: 73
Pressure Low: none
Pressure High: none
Country of Origin: Canada

i did a vacuum and the system ,will not any 134-a not getting any juice,(elect.) i took off the high and low side connections at the compressor and there is no sign of black death very clean. cant get any readings, the compressor clutch will jump in ONLY if it is wired direct from the battery, the system seems to be blocked maybe the expansion valve is closed or ??????


dasinc on Fri May 29, 2009 6:27 PM User is offlineView users profile

Your system has a low pressure switch that will not allow voltage to the compressor if it doesn't have sufficient pressure in the system. Have you tried to add refrigerant. We probably need more info in order to help you. What are your guage readings? What makes you think that the system has a blockage?

Take care,


[email protected]

jack31ca on Fri May 29, 2009 7:54 PM User is offline

i cannot get any gauge readings because there are none the syatem is bone dry, the system is not getting electricity ,there is no power going to the compressor and it is NOT taking any 134a not even a part of an ounce what el;se can i say , ther is no static pressure, how would i overcome the pressure switch , can i jump it with out screwing the system


bohica2xo on Sat May 30, 2009 12:56 AM User is offline

Put the jumper wires away, they do more harm than good.

When you say "no readings" do you mean "0" as in atmospheric pressure, or 29.8 inches of HG?

If you have evacuated the system, your gauges should read that vacuum. It sounds like you have some sloppy conversion connectors, or two sets of schrader valves installed.

Even a system that is at atmospheric pressure will take some 134a, and show a static pressure equal to the can.

Once you have good service valve connections, check for vacuum. If there is no vacuum in the system either you have a leak, or you did not evacuate the system. Pull a vacuum again, and see if it holds.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

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