Question about 2003 BMW Z4

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The air conditioning blows only hot air

The pressure on high and the low sides showed the same values, around 95 psi

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  • epernas Jun 29, 2009

    Thanks Molson for your very valuable input!.

    I guess I will have to replace the a/c compressor as the clutch was engaged upon turning on the a/c and the low and high reading did not change from about 95 psi.

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  • BMW Master
  • 3,854 Answers

Is that your static pressure readings??? If that is your static pressure readings that's good. When the engine running and fan on high and a/c compressor clutch engaged you should have 25 to 35psi on your low side and 200 to 350psi on your high side. If the clutch is engaged and that is your readings, replace your a/c compressor. Keep me posted, be glad to help.

Posted on Jun 29, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 29, 2009

    You can do the labor your self to save some money, Replace the a/c compressor, accumulator (air dryer), and orifice tube (Expansion valve). When putting the a/c back together just make sure you Oil the O rings and after you have everything replaced, have the system vacuumed and recharged at a A/C shop. This should keep you under $500.00, you can call around to see who rebuilds A/C compressor around your area to save you more money or look on line. Good luck and keep me posted. 

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