highboy

Curious if anyone can give me a quick tip on the A/C system pressures of my '90 964. I replaced the condenser and drier, pulled a vacuum on the system for over an hour (no leaks), added correct oil to the system and then filled the system to specifications with r134a refrig. Based on my manifold gauges I am at ~15 psi on low side and ~325-350 psi on high side with the motor running at 2000 rpm. The vent temp is ~47 degrees on a 86-90 degree day with high humidity. My question...is the high side too high? In my research I should be around 210 to 290 psi. Again, this is with the car standing still, so I would expect with the car moving and pulling air over the condenser the pressure may drop a little. I just want to make sure that I am not damaging the system.

Thanks in advance for all help.
-T

Rocket Rob

There is a pressure table in the workshop manual (page 87-12). It says at 90 degrees (32 C) that the high side should be between 16-19 bar (232-275 psi). This is using R12. Not sure how R134 affects this.

highboy

Thanks...I think I have it sorted out. I was a bit over charged, but once I pulled the pressure down on the high side I was golden.

Rocket Rob

Glad you got it running properly!