328 heater controls problem

The air direction unit is under the front bonnet. Remove the spare tire and screws holding the spare tire plastic holder section/cover. You can slide it forward so you can see up under the front windshield. The air direction unit is up under the windshield (passenger side) and has an air duct running to it from the heater core located on the passenger side. The heater core is located about 6 inches from the back edge of the bonnet and mounted on a wheel well platform. Should be obvious once you see it.

The same set up will be seen for the driver's side and is located on the driver's side. I would check the electrical connections first. Mine was having issues as well but after checking out the connections, things started working again. I suspect a bit of corrosion at some contacts or one of the connections may have worked itself off.

Good luck.

 

Just like John says. hope the pic helps clarify; yellow circle is servo for airflow direction, green marks heater valve.
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Is the passenger side ventilation fan wiring etc in the same place as the temperature/direction wiring stuff (under the plastic cover near the spare)?
Thanks in advance.
Best regards,
Dino

 

Follow the air ducts from the heater core to the front of the car. There are two blower fans up front on the driver's side (US car). You should be able to easily see them from up top. However, you may need to get under the car to trace the wiring. This part I have not dug into so I don't know the wiring actually runs. Sorry, no pictures.

 

Are you absolutely sure the switch itself is OK?

I believe there are several connectors, at least the one in the forward 'bulkhead' and possibly more in/under the tunnel.

EDIT - If you have access to the wiring diagrams - check scheme 8 (heating / airco / cooling system), it only shows connector 128 (wich I guess is the footwell).
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Yes and no, it follows the main loom all the way to the headlight-motors, then goes down to the two electrical fans. Here's 2 shots: first shows the air ducts (front, left side) the second shows the wiring loom going downwards behind the headlight mount.

My right hand side fan isn't working either, will have to investigate myself (some day ). You'll have to go in from access panel on the underside of the car.
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remove footrest-panel to access connector to front train. Access to tunnel loom: remove seats, gemove shift knob and gate, remove ash tray, then probably remove most if not all switch gear, loosen 4 screws to lift entire tunnel.

Good luck !

 

Thanks for the info guys. I greatly appreciate it.

Best regards,
Dino

 

Great, that saved you quite some trouble then, I never got myself to taking out either part of the tunnel (yet). Perhaps a dumb question - have you tried something like electrical connector spray (to dissolve any oxidation etc)?

A seperate wire would at least solve the problem. See attached picture (infamous around FC I guess but that's another story) to see the main loom in the nose section:
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