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Discussion Starter #1
HI

Before I start looking for things that aren't there

1989 E34 525i M20 2.5

How are the controls for A/C and heater supposed to work?
(I don't have a user manual and google has been no help)

So far I have managed to get the dual zone heating to work (It was a PITA to fix the hot water valves)
I know I have to have the drivers side (RHS here) rotary knob slightly on to make the thing work
The passenger side (LHS) will then work
Dual zone works OK
A/C on/off button OK

However when I push the recirculate button it turns on the a/c as well IS THIS NORMAL?

I am also trying to find out what BMW relay part number fits into what position in the dist box
In particular the K4 (Blower) relay which has a diode in series with the coil (I don't seem to have one )

(Noted that "General Purpose" relays don't go everywhere)
 

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Discussion Starter #2
"However when I push the recirculate button it turns on the a/c as well IS THIS NORMAL?"

Yes it is thanks!

Relays are a pain. Some marked on the circuit don't exist in the car very confusing
Anyway everything works after some small rewiring so I'm not bothered anymore
 
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