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I have an 07 530xi. I’ve searched for weeks. I have found several people with the same problem but no solution. The ac blows warm. No cold air. INPA showed an error fault code for the water valves (both sides) and for KMV (ac compressor valve). I replaced the water control valve and the KMV. Vacuumed system, system vacuumed fine, held vacuum for over an hour. The error for the KMV is gone but I’m still getting the water valve errors. I’ve checked KLIMA in INPA. all dials/functions seem to be working as they should. When I checked the values, the voltage readings on the water valves are 0 no matter what I do. The right pulses every now and then to max but only briefly. The Powersense Driversupply and KMV Open load are WAY maxed out. What is the Powersense Driversupply and how does it affect the KMV? I’m lost on this one. Attached is a screenshot of the INPA data. The readings were the same before and after the parts were changed.
Last edited by donpb; 09-11-2024 at 01:31 PM.
Reason: Fixed title
I have an 07 530xi. I’ve searched for weeks. I have found several people with the same problem but no solution. The ac blows warm. No cold air. INPA showed an error fault code for the water valves (both sides) and for KMV (ac compressor valve). I replaced the water control valve and the KMV. Vacuumed system, system vacuumed fine, held vacuum for over an hour. The error for the KMV is gone but I’m still getting the water valve errors. I’ve checked KLIMA in INPA. all dials/functions seem to be working as they should. When I checked the values, the voltage readings on the water valves are 0 no matter what I do. The right pulses every now and then to max but only briefly. The Powersense Driversupply and KMV Open load are WAY maxed out. What is the Powersense Driversupply and how does it affect the KMV? I’m lost on this one. Attached is a screenshot of the INPA data. The readings were the same before and after the parts were changed.
What errors do you have. I bet it's telling you the issue
It’s showing 9C79 water valve right
and 9c79 water valve left. Same errors after I changed it. I wire has no voltage, one has 5.72 and one has 8 volts. I just can’t figure this out. It did have a ac control valve error but it went away after I replaced it. I believe something is messing with the signal to the water valves keeping the ac valve from opening.
I will definitely check this tomorrow. The values change in inpa but I’ll check it at the plug with a voltmeter. One side is a little warmer than the other. That may be why I’m showing voltage a little higher at one side. I didn’t move the climate controls when I checked voltage. I’ll check and see if the values change. This will for sure get me on track I believe. Thanks!
Look at your whole list and post them. There's things that affect the a/c that doesn't fall under the IHKA. This is why I keep asking for all the codes to make sure you're troubleshooting correctly.
09-08-2024, 11:04 AM
Need ac help!
