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bmw problems

NY450ES on Thu June 11, 2009 10:30 AM User is offline

Year: 1990
Make: bmw
Model: 325i
Engine Size: 2.5
Refrigerant Type: r12
Ambient Temp: 63
Pressure Low: 0-vac
Pressure High: 100
Country of Origin: United States

changed the compressor and acc/dryer 2 yrs ago. previous compressor leaked, there wasn't any signs of black death. we flushed(from high side to low each part) out the condensor and evap with laq/thinner and 150psi shop air. then pulled a vac for 1hr. held vac. Ran great for 2yrs. this year a/c doesn't work at all. put the guages on with a/c off and had static press of approx 70-80. turned engine on and a/c on, low side slowly crept into vac and high side stayed at 90. after a minute or two the low side creeped up out of vac to around 7 and high side started to gradually climb over 100. the suction line was room temp and high side line was the same. after another min, low side is gradually creeping up and high side was also creeping up. another min passes low side is at 40 and high side is at 300. the whole time the guages slowly crept up. low side line was getting cold(very little) and high side line was starting to get a little warm. any suggestions?

Edited: Thu June 11, 2009 at 11:47 AM by NY450ES

NY450ES on Sat June 13, 2009 9:46 AM User is offline


Voyager97 on Sat June 13, 2009 12:59 PM User is offlineView users profile

Those pressures are way out - both too high for a 325i.

Normal operating pressures are 15 - 30 psi Low Side, 185 - 205 psi High Side. At 63f ambient you should be seeing around 150 psi on the High Side, not the 300 psi you are getting.
If the air at the vents is only slightly cool, (should be around 42f at 40 psi Low Side) and there are some bubbles showing in the sight glass, I would lean towards air & moisture trapped in the system.

That will, unfortunately, mean a full discharge, replacing the accumulator/drier (or just the dessicant if possible) followed by a deep vacuum & recharge.

Before doing that tho, check for airflow restrictions in the condenser.

Vic @ Pennine AutoChill

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