I have BMW 1999 323i, I keep having problem with AC. I have replace a new compressor and all Freeon are good. just crazy sometime have cold and sometime no cold air. I take it back to place replace my compressor and Happen same to them. thier said electrical problem but thier having figure yet. thier been keep my car for a week. thier said sometime no power or volt to compressor. I don't know what to do next anything will help
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It is not your A/C the problem, try this:
1- Apply the brake.
2-Open ignition to on position II engine off.
3-make sure to set A/C to low temp with A/C button off.
4-Start the car while keeping foot on the brake.
5-push A/C button on and make sure that a/c compressor comes on and wait around 10-12 second.
6-Let foot of the brake and wait ,check if DSC light comes on if not pump the brake several time with A/C compressor on if light comes on, if it dose mean your MASTER CYLINDER BRAKE SENSORS NEED CHANGING.
This was the solution for my car,I had exact the same problem.
you can try and jump the high pressure limiter switch on the expansion tank, sometimes they get a bubble. Its the silver cylinder looking thing near the firewall. follow the cooling pipes from the compressor back to the tank if theres a question, on the top or near it will be two wires going into it, undo that switch housing connector and hook a jumper wire up there. switch may have to be replaced there. dont run that for any length of time with the jumper, just to diagnose.
Just a guess....it sounds as if your leaking refridgerant gas from your AC unit. Maybe you didn;t need to change the compressor. the leakage could be on either the high pressure or low pressure side....Something that may help is to mix up some soapy water, use plenty soap, then sponge the mixture around all the joints that you can see....go as far as you can and as close to the fire wall between the cabin and the engine compartment....With the AC turned on, look out for bubbles....If you see them, thats where your leakage is.....Hope that this imfo helps you to solve your problem and keep your cool.