The Electrics, Dashboard and Heater 12 Heater (1)
26 Citroen XM Internet Reference Version 1.0
3/3/99
An ’L’ shaped philips screwdriver came to my aid, and off it came.
It was jammed solid so I removed 4 tiny screws parting top from bottom and inside I found 4 plastic cogs,
all were jammed. A cog had somehow jumped out of its recess.
This was put back into place, all cogs were lined up and the tiny motor checked out ok using a 3 volt
torch battery.
The whole ensemble was put back and hey presto it now works perfectly.
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control board
My 2.0si had the same problem. The cure was to replace the blower motor with a secondhand one. Only
the control board attached to it needed replacing, but a complete secondhand motor was cheaper than
a new control board £50 for motor £80 for control board!
Getting to the control board
The board is fitted inside the motor assembly. The motor assembly is held under the dash panel by three
screws.
To get to the control board you have to remove the motor.... its a push fit into the casing, but rather tight!
You should be able to see where the motor assembly is held, push the rubber bits gently with a
screwdriver and eventually it will come out.
Unfortunately, apart from two power transistors, the control board itself consists of potted surface
mount, I changed the power transistors but that only ’fixed’ the on speed - it ran slower :-( In the end I
changed the board, well the motor assembly,
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you have to remove the heater fan three screws drop the fan out undo the circiut board and ease the fan
out of its housing (TIGHT BUT WILL COME ONLY HELD BY RUBBER MOUNTING)you can remove the
board components available at rs or farnells but normally the board itself is damaged far better to fit
anew one.
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Dear David,
Following our recent telephone conversation regarding the heater fan on my 1990 XM 2.0 Si, I promised
to inform you of the outcome, so here it is.
You may remember the problem was that following a prolonged period of running on fan position 3, the
fan continued to run at that. speed irrespective of switch selection. My "Electrical Friend" checked out
the switch and as far as possible the relevant relays (which were slightly different to those shown in the
Revue Technique diagrams).
On your advice I phoned Andy Burnett who said the problem was in the Diode Pack bolted to the motor
and the best solution was to obtain a complete replacement motor from a scrapyard.
No luck with the local scrap yards (not many XMs round here - even fewer broken ones) and the Citroen
dealer quoted £185 for a complete motor or £84 for just the electronics plus VAT of course. So back to
the "Electrical Friend".
The motor was easily removed, having first removed the panel under the glove box on the passenger's
side. This exposes the fuse box and to be on the safe side Fuse F25 was removed. Three screws and a
couple of electrical connectors release the motor. Sure enough there is an electronic pack, held by two
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