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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-10-2009, 10:47 AM   #1 (permalink)
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AC Problem 2002 330 CI

I have a specific problem in by car. It has been to the BMS dealership and it has tested ok. Proper amount of refrigrant, no fault codes. It is an intermident problem, it blows warm air occasionly. What could be the possible problems.
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Old 08-16-2009, 12:51 AM   #2 (permalink)
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check magnetic clutch operation when u have hot air blowing. If not engaged, then faulty clutch. If engaged, check operation of the solenoid valves that control flow of coolant into the heater core.(they probably do not close fully there by compromising cooling efficiency).

TEST #2: If u have warm air blowing feel the larger of the a/c pipes at the firewall.. If cold, then it's likely the solenoids. If the larger pipe is warm to hot. A/C problem. Suspect expansion valve or partially clogged system.

Other factors causing loss of cold(intermittently):
-too much oil in system
-moisture in system
-contaminated receiver.
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