Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Trying again Started over......

salth2oj on Fri August 06, 2010 9:01 PM User is offline

Year: 1999
Make: Saab
Model: 9-3 convertible
Engine Size: 2.0t
Refrigerant Type: 134a
Ambient Temp: 92
Pressure Low: 36
Pressure High: 330
Country of Origin: United States

I thought it would be a good idea to start over. I evacuated the system and pulled a vacuum for 50 minutes and then a let it sit for another 30 minutes to make sure I had no leaks. All looked good. I then charged the system with 770 grams of R134a (per the label).
I then started to monitor the vent temperature and the site glass. The best I was able to get the vent temp was 58 degrees and the site glass looked clear.
The high pressure I feel was way too high, I even at one point seen it go to 360.
The radiator fan is working correctly and the condenser is all clear.
Any ideas what is going on?

bohica2xo on Sat August 07, 2010 2:27 AM User is offline

That system does not hold much oil - 5 ounces of PAG 46 is the total system charge.

If you have too much oil, it can really hurt the cooling and cause high pressures.

What is the history of the vehicle? Has it been through a compressor explosion or 3? If so, the condensor may be junk - on the inside.


"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.

salth2oj on Mon August 09, 2010 6:57 PM User is offline

salth2oj on Mon August 09, 2010 7:11 PM User is offline

Thanks for the reply.
The history as I know it, as just purchased this car a few months ago.
I found a leak in the high pressure line going to the condenser, replaced the hose and the dryer. The system was empty when I got it.

I just added another 60 grams of R134 and now I have a little different situation. With the car @ 1800rpms, I have a high pressure of 250psi and the low pressure at 30psi. The problem now is the low pressure starts at 30 and slowly drops to about 15psi and the high pressure starts to rise until the compressor kicks off. The compressor is running for about 1-2 minutes then kicks off for about 20-40 seconds. The other item I noticed was the high pressure needle is a little jumpy (it is moving about 8-10psi), normal?
The good news is… when compressor is running the vent temp get to 48 degrees. Not sure if I made progress or not.

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.