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How to take AC sensor readings

rick52768 on Fri June 15, 2012 4:22 PM User is offline

Year: 1989
Make: Buick
Model: Riviera
Engine Size: 3.8l
Refrigerant Type: R-12
Ambient Temp: 89
Pressure Low: 110
Country of Origin: United States

I believe that my A/C Orifice Tube is clogged. Which I know that it means there is a lot of metal in the filter that should be on compressor. I have a 110 reading on the low side, the compressor will not turn on (but can be turned by hand) and that "crazy dash information screen" states that it is low on freon. I have a sensor on both sides of the orifice tube and one of the low side. I think the sensor on the low side is type which give a open when it is low on freon and closed when there is a charge on the system. So how can I test all three of the sensors with a fluke DVM meter? Thanks

mk378 on Fri June 15, 2012 4:34 PM User is offline

Try disconnecting the battery (with the key off) to reset the lockout in the computer. It should then run again, but if it cycles rapidly with low pressure that means it is low on freon and it will detect that condition and lock out again.

rick52768 on Thu June 21, 2012 12:16 PM User is offline

Thanks I will try that. BTW, do you know how to "Subscribe to this topic"? I never got any emails and I would if I did or did not click the box to subscribe when posting my question. Thanks and I will let you know if it work.

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