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1998 Aurora Help

djboo4you on Sat May 22, 2010 11:52 PM User is offline

Year: 1998
Make: Olds
Model: Aurora
Engine Size: 4.0
Refrigerant Type: R134a
Ambient Temp: 70
Pressure Low: 53
Pressure High: 245
Country of Origin: United States

So this is my girl's car, and she is complaining that it isn't getting gets cool. I took static pressure and it was 105 low side and about 110 high side. With the car running i get about 53-55 low side and 240-250 high side with a vent temp of 60 degrees. Now as the engine temp rises so does the pressure. It gets up to 60 low side and a little over 300 high side. When the engine reaches 230 you can here the fans speed up and the pressure on both the low and high side drops to 45, 240. If I can get some advice as to how to improve the efficiency of the a/c that would be greatly appreciated. Thanks

GM Tech on Sun May 23, 2010 9:55 AM User is offline

During your testing, mist some water on condenser- from a garden hose- this will help you understand that you may have an airflow across condenser problem if cooling and pressures improve.

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......

djboo4you on Sun May 23, 2010 9:29 PM User is offline

Thanks for the reply, I did take the car to the do it yourself car wash and power washed the radiator and the condenser (lots of bits and leaves). I removed the shroud that covers them too so I was able to wash them very well. I wasn't able to take pressure readings (no time today), but I can tell u that the vent temp while driving was between 49 and 53 (digital gauge) that was when it was 80 outside today. This is def. an improvement, but if I could drop it even further that would be obviously better.

djboo4you on Thu May 27, 2010 7:18 PM User is offline


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