[E34] Electrical gremlins after some time standing still

[Frank87]

I checked out some ground points and some areas where theres alot of cable. Nothing found. I have absolutely no clue now where to look.

Every module associated with the IHKA and general car stuff has been swapped. No change.

The problems:
- cold air doesnt work whether A/C button is on or off. IHKA blows hot only
- A/C doesnt work, there is no way to get the compressor going. System is leak free and full. All wiring resoldered where needed
- rear window defroster does not work at all
- check control on the instrument panel does not work. Bottom bar does not light up and if you shine with a light it says "Check Control, Betriebsanleitung"

I am going to take a break from this for a few weeks. It drives me nuts. I'll focus at some small mechanical things and drive the E39 daily.

[632 Regal]

Does the AC work if you jump it?

[Frank87]

Does the AC work if you jump it?

Fine idea!

I will jump it by jumping the relay. I think it will work as the system has pressure and keeps pressure. However, if the flaps in the interior do not work and if the interior does not close the heater valves, I wont be able to get legitimate cold air inside.

Ill let you know what happens.