Fault on ventilation switch Xantia

Garysz · Unread post by **Garysz** » 18 Jul 2006, 11:04

Car: Xantia, diesel, 2001

Problem: Ventilation blower on max all the time.

Solutions: 1 Buy a new unit and get local non-dealer garage to fit - if so how many hours and cost of new unit?

2 Buy new unit from scrapyard and the get garage to fit - are all xantias the same and is the Peugeot version an option?

3 Mend old unit - it seemed very difficult to remove as there are cables attached to vents - I know my limits and don't want to make it worse - the other three sliders work!

Your advice would be very useful!

Clogzz · Unread post by **Clogzz** » 18 Jul 2006, 12:24

The fault is in the motor electronic speed control if the car has air conditioning, or in the regulating resistor if it’s got no aircon.
It’s not in the controls and cables.
If it’s got aircon, the speed regulating transistors under the motor are shorted.
The replacements are MJ11015.
If it’s got no aircon, then the fault is probably this fuse blown.
It’s a 170ºC thermal fuse.

Garysz · Unread post by **Garysz** » 18 Jul 2006, 13:23

Thanks for this.

The car has aircon.

I was quite good with a soldering iron.

Could you explain where this circuitry is located?

mezuk04 · Unread post by **mezuk04** » 18 Jul 2006, 13:57

I believe the bits that Cloggz refers to is on the actual blower motor itself, nothing to do with the slider controls which he states.

Mend old unit - it seemed very difficult to remove as there are cables attached to vents - I know my limits and don't want to make it worse - the other three sliders work

Peel back the passenger footwell carpet (from the top at the dash) to expose the blower motor fan. Should just be held in with a few screws, gently remove while disconnecting the necessary attached wires.

And while your in there, check the condition of the pollen filter (if its the same as the Mk1's), should be to the right of the blower motor either held in its housing with a couple of screws or the lid just slides off to expose the filter.

Clogzz · Unread post by **Clogzz** » 18 Jul 2006, 14:36

Yippee Mezuk !

… Chris ?
Very comprehensive and 100% right.
Pictures and story here:

http://www.frenchcarforum.co.uk/forum/v ... hp?t=19339

mezuk04 · Unread post by **mezuk04** » 18 Jul 2006, 14:39

Chris is indeed me

I'm getting rather good at this m'larky now!

Shame I dont own a Citroen

Garysz · Unread post by **Garysz** » 27 Jul 2006, 14:29

Thanks for this.

I took the motor out, but the transistors appeared to be riveted in. So went to scrap yard and acquired a new old motor. Not the same model but the electonics looked the same. Swapped the eletrics over - v simple two nuts and a bit o leverage - and now it works fine.

Thanks very much for you help!

Clogzz · Unread post by **Clogzz** » 28 Jul 2006, 14:13

Nice to read about another good outcome.

Might be an idea to keep the faulty speed regulator, in case of a coming scarcity of fan motors.
From what I see on the French ‘Planète Citroën’ forum, the wreckers are becoming aware of the value of the fan motors, and are starting to charge accordingly.
At your little leisure and convenience, you could measure the transistors for short-circuits.
If they are, you could drill out the rivets, and refit new transistors with screws and nuts.
If you’re not going to need it, one day someone may happily shell out some good money for it.