Heater Control Console, How do I get hold of one?

[nez242]

I've recently acquired a '91 2.1 TD SED. There's no heater control (fans work fine). I've checked fuses and all seems okay. I'm wondering if I need to get hold of a replacement board. The current one has the numbers 73402702 and 251705 F on it if that means anything. Any ideas where one may be tracked down?

[nez242]

I managed to get hold of a replacement from the nice people at Edwards & Son. Cost £50 and made no difference! Will place new thread to see if anyone can help me get to the bottom of this.

[Sharo]

You should chack the motorised control unit. On LHD vehicles is placed under the steering wheel on the wall of the heating block - black box held with 3 screws and white plug on a short wire. On RHD vehicles i have no idea where it is, probably the same place on the passenger side. I think there was info about this module in "Self help files".

edit: I couldn't find it so here is my info. The connector has 5 pins - 1 and 2 is the motor itself - you can test it with 12V (short pulses - you may break it). The other 3 wires are for position pot - measure resistance between 3 and 5 and 3 and 4. You can try to open it and see if inside everything is ok. Mine had worn tooth on one of the wheels inside.

This post has been edited by Sharo on September 13, 2010 10:36 am

[nez242]

Cheers Sharo!! A bit of a fight with the air duct but found the motorised unit where you said. Checked it over and seemed to be working. Fitted it all back together and, joy of joys, hot air!! Suspect that a previous owner had undertaken some fiddling, hand removed the unit and not lined the splines up properly so it didn't operate the flap. Winter does not seem so threatening now. Many thanks once again!

[Sharo]

Keep in mind that it may fail again. Sometimes it just stops working, and some knocking on the box "fixes" temporary the problem.

[nez242]

You're right and it did! I have a temporary solution; having removed the motor unit and the passenger footwell covers to the fusebox, etc I find I can now reach the flap lever with a bit of tentative groping around. Not recommended whilst on the move but at least I have some control whilst I investigate whether it is the motor or the supply that is the problem!

Toodle-pip!

[Sharo]

Almost certain it is the motor or the potentiometer inside. You could try to read the fault codes with the resistor/led tool - there are separate fault codes for potentiometer and the motor (short circuit indicates worn brushes of the motor).