Question about 2001 BMW 5 Series
Put some soapy water on the hi and lo schraeder valves - chances are there is a slow leak.
If your mechanic has checked with a blacklight thouroughly all connection points - there is nowhere for the coolant to escape but the valves.
High side <200psi. Low side <50 lb.
"A good rule of thumb with R134a is to run fan on High with all windows open and engine at 1500 rpm. High side pressure in PSI should be about 2.2 to 2.5 times outside air temperature in degrees F"
The extremely high pressure on the high side and normal pressure on the suction side indicates that the evaporator is overheating. The fan needs to be turned on when the A/C compressor is on.
If its going into the 200's then the compressor is obviously good. If the orfice tube is blocked, you will see a low side pressure drop in most cases. Check the condesor coil (near radiator) make sure its not dirty. A high pressure on the liquid side could mean several things. One, a dirty cond. coil, too much freon in system, a block orfice (or if equipped) a sticking TXV, or even outside temps too high.
Now that I think about it, first check if there is good airflow between the fan and the evaporator. If the evaporator is too far forward air will not pass through it... it will simply go around the evaporator.
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Posted on Apr 21, 2009
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Posted on Jan 02, 2017
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