Question about 2001 BMW 5 Series

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I have a 95 540 and had my a/c filled 3 times but it leaks out in a week. So i had my dryer replased because mechanic said it was bad. But the problem didnt go away. Mechanic told me to replace the compresor. But the comp. seems to be fine. He put in a dye liquid into system but couldn't find no leaks. Oh and another thing. The pressure of the sys. is 220. Kind of high. Please help?

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  • gold7 Apr 21, 2009

    Hi. I forgot to mention that when the comp. turns on the car vibrates. I don't know if that has anything to do with it. Buy the way, Where are those valves located?

  • gold7 Apr 21, 2009

    Hey thaks a lot. I'll check those things and hopefully get it fixed. Thanks for the details.

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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.

Thanks for using FixYa!!

Posted on Apr 21, 2009

  • blueextc3221
    blueextc3221 Apr 21, 2009

    Those schraeder valves are the fill ports for the high and low side of the unit.






    Vibration of the car when the compressor turns on tells me the clutch on the compressor is starting to (or has already) fail.



    Here is a schematic of all the components in the system...






    Whan the compressor kicks on - there should be SOME vibration - but not very noticeable.

    If the car shakes any more than that - the mechanic was correct in his SECOND diagnosis that the compressor is bad.



    Not convinced he has done a thourough check for leaks - as the coolant has no place to go but out of the system!! Not like when a head gasket blows - and coolant can be burned up in the normal combustion of the engine... in the AC system - the refrigerant is inside the system - or its leaking somewhere :D



    Condenser coil is a common place to check - hard to see inbetween all the fins.

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