Automotive Air Conditioning Information Forum (Archives)

wrench on Fri August 26, 2011 1:28 PM

Year: 2005
Make: GMC
Model: SAVANA 3500
Engine Size: 4.8L
Refrigerant Type: 134A
Ambient Temp: 90
Pressure Low: 50
Pressure High: 100
Country of Origin: United States

static pressure 90 psi, no clutch activity when turn ac on. jump low pressure switch, clutch engage, cool, high side to 100, low side 50.
what am I missing?
Thanksss wrench

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diesel is music, music is noise!

GM Tech on Fri August 26, 2011 2:31 PM

You need a new switch- the one you jumpered-- a/c low pressure cycling switch

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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......

wrench on Fri August 26, 2011 3:41 PM

Thank you much, it's work.

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diesel is music, music is noise!