Oct 032014

ac doesn’t work old ac/heater control was missing button so bought a new one replaced and it doesnt turn on the compressor any suggestions?

  One Response to “99 bmw 528i”

  1. Check to see if voltage is being sent to the compressor. If not, check for voltage at the low pressure switch. If you only see voltage on one side of the low pressure switch, you can jump across the switch to test that the compressor turns on for a second or two. If it does, your Air Conditioning System id low or empty of freon.

    Step by Step Air Conditioning Trouble Shooting

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