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BMW 325is: Good Pressures, Less Good Vent Temps

94RX-7 on Sun May 18, 2008 11:21 PM User is offline

Year: 1993
Make: BMW
Model: 325is
Engine Size: 2.5l
Refrigerant Type: R-134a
Ambient Temp: 82
Pressure Low: 30
Pressure High: 215
Country of Origin: United States

Just got finished helping a friend replace the condenser on his 1993 BMW 325is. The replacement condenser, sourced from BMW, was a parallel flow type rather than the tube and fin model that originally came on the car. The new condenser included a sticker indicating that the charge was 1.8 pounds whereas the sticker on the car previously called for 2.2 pounds. The dryer was also replaced, and 3 ounces of oil was placed into it before it was put onto the car. Pulled a vacuum on the system, checked for leaks, didn't seem to have any, let the pump run for another 30 minutes or so, and put one can of R-134a into the vacuum. Started the system up, put another whole can in, attached another can, and slowly let it in until the high side stabilized at 215 psi or so, and the low side was at 30. Probably no more than 1/3 of the 3rd can. We were seeing vent temps right around 60 degrees sitting stationary with the engine at 1500 RPM....we're thinking we should be seeing temps closer to 50 or 55 degrees. What might the problem be? Not enough refrigerant? Too much oil? Weak compressor?

bearing01 on Mon May 19, 2008 11:34 AM User is offline

When driving above 50mph does your vent temperature come down below 60'F ?

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