E34 A/C Always on

[Frank87]

Yes. When I have control over the A/C. The aux. fan won't run unless it has to. When I lost control of the A/C, the aux fan would always run on low speed. That little wire did cause some stuff.

I have professional A/C equipment this friday. It will empty and vacuum the system after which it can add exactly 1,55 kg of R134 + PAG. Ill use the diagnostic equipment to measure the low and high zone pressures. If I can measure the pressure using the OBD/ADS interface, the car knows the pressures as well.

[632 Regal]

Yes. When I have control over the A/C. The aux. fan won't run unless it has to. When I lost control of the A/C, the aux fan would always run on low speed. That little wire did cause some stuff.

I have professional A/C equipment this friday. It will empty and vacuum the system after which it can add exactly 1,55 kg of R134 + PAG. Ill use the diagnostic equipment to measure the low and high zone pressures. If I can measure the pressure using the OBD/ADS interface, the car knows the pressures as well.

Okay good. Just had to mention that because I HAVE seen people replace AC parts without vacuuming the system with less than positive results. You should also drain the oil from the drain points prior to vacuuming IE: the pump or adding the recommended amount can be too much. I have a HVAC and EPA licence from the days of pacman on this stuff somewhere lol.

Have you checked the voltage of the stock wire, 'man made' wire while disconnected to see what might be going on? The 'man made' wire might be back feeding something in an attempt to fix something irrelevant.

What year is yours?

[genphreak]

Yes. When I have control over the A/C. The aux. fan won't run unless it has to. When I lost control of the A/C, the aux fan would always run on low speed. That little wire did cause some stuff.

I have professional A/C equipment this friday. It will empty and vacuum the system after which it can add exactly 1,55 kg of R134 + PAG. Ill use the diagnostic equipment to measure the low and high zone pressures. If I can measure the pressure using the OBD/ADS interface, the car knows the pressures as well.

Nice, how'd it go doing the pressure checks? What the board needs of course is some pics and a little how-to ;-)