Model: Grand Prix
Engine Size: 3.8L
Refrigerant Type: 134a
Ambient Temp: 90
Pressure Low: 100
Pressure High: 150
Country of Origin: United States
Picked up a 1998 Grand Prix for my daughter last week. AC blew just a bit cold so I assume it needed to be topped off. (Compressor runs fine/ constant while AC is turned on) I put the gauges on and noted the low side reads at around 100psi) If I recall a plugged orifice tube symptom is a very low or negative low side reading. From some searches I have seem recommendations to change the compressor or the refrigerant control valve on the compressor. Does this sound like the direction I should go?
You need to be sure you have the proper amount of refrigerant in this system, 35 ounces. If you still have odd readings like you have posted I would suspect a bad control valve.
Sounds like the pump s not engaging-- is clutch turning? 100 psi is most car's static pressure.... with a hot engine
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......
Edited: Mon August 10, 2009 at 1:54 PM by GM Tech
yes, compressor is definately turning on with AC turned on and confirmed running by looking at clutch and hearing it click.
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