Air Conditioning problem
1999 Other Volkswagen Models 4 cyl Front Wheel Drive Manual 110, 00 miles
I have a 1999 VW Cabrio. Car is cooling, but not as well a before. Inspection of the A/C system doesn't reveal any obvious leaks. Air out the vents is only 65 deg. High side pressure is 235 psi and low side is 67 psi @ 1500 rpm. When the radiator electric fan kicks on the High side drops to 190 psi and Low side stays at 67psi. Conditions : OAT 81 deg. Dry bulb, 74 deg. Wet bulb, and 74% RH. The low side seems high, but I can't confirm that as I don't have any manufacture numbers.
I was thinking the low side should be around 25-35 psi. The high side appears to be close to normal (which I think is about 200-225psi). This system has never been touched since the day it was new, so it hasn't been overcharged by some tech. Any thoughts on this system would be appreciated.
Monday, August 4th, 2008 AT 1:30 PM