I got a copy of the BMW 7 Series Manual from Bentley and looked at the AC Troubleshooting guide.
Symptom: AC system does not cool or produces low volume
1. AC compressor not engaging
2. Refrigerant charge too low or too high
3. Heater valve malfunction
4. Evaporaor iced up
5. Pressure Switch Faulty
I am pretty sure that 1, 2 and 4 are not the problem, but 3 and 5 could be the problem.
The manual states to test the heater valve and pressure switch, but there are no instructions on "hot to" test these items.
Can you tell me how to the the heater valve and AC pressure switch?
Tuesday, June 23rd, 2009 AT 12:45 PM