First post here after getting my first E30.
It's a 1990 325i convertible, it's been sitting unused for a few years and I'm slowly getting through the list if things todo.
Here's how the car looked when I found it, and I had to try and save it:
Most have been simple enough, except the current job and that's no heat from the heater vents. It just blows cold air.
The car has the optional climate control which I understand wasn't a common option.
I've checked the heater valve and that works as expected and the heater matrix warms up as expected. The heater pipes from the engine are both warm so hot water is flowing through ok. I can also hear the heater valve open and close when I adjust the heater control.
However the motor that opens and closes the flap that send the air across the heater matrix doesn't open so the air never passes over the heater.
I bench tested the motor and it opens and closes fine with a 12v source.
I measure the voltage from the heater control and when the signal is sent to the motor to open the flap is a very low amp 12v. The signal to close it a strong ampage 12v and closes without problem.
It's a lot of wires in/out of the heater control (about 20 or so). So I assume a lot of different things are possibly measured. The climate control unit itself has a small fan to draw air in from the cabin to measure the temperature. Not sure if there's an external thermometer someplace. Although if it's the same one as the OBC it reads ok.
If anyone has a wire diagram for the climate control I'd really appreciate it or any tips on how to trouble shoot the climate control unit. Or in worst case even have advice on how convert to the normal unit.
Thanks
Alan
