Xsara Heater stuck on full blast!

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Clogzz
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Post by Clogzz »

Very interesting ! :D

Never seen a relay on my motor, but then I never took the pcb out.
It all makes very good sense.
The relay is for the maximum speed only, and the transistors are for the lower speeds. Image
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Re: Xsara Heater stuck on full blast!

Post by Skull »

Bought a Xsara Coupe 2.0 HDi (2003) as a 'good runner' but so far it's spent more time in pieces .... :roll:

My blower was running full blast all the time and annoying me so decided to try and fix it.... electrics especially modern 'electrickery' are not my specialty :oops:

I was going to just wire in an on/off switch through the fuse box but that would mean drilling the bulkhead to run some 40 amp wire through ... then I thought maybe just take the control switch out and try and wire a switch into the live feed that way .... the dash is half out and I have removed the heating control unit .... bizarrely enough the fan still runs with the engine running even though the heating control unit is totally removed :shock: .....I thought there might be a type of rheostat in the unit controlling the speed of the fan that had failed :?: I was expecting the fan to at least stop running when disconnected but now realise it's better as a fail-safe to have it running than have no demister at all .... clever guys @ Citroen :wink:

That's when I decided to have a look on here and from what I've read and the parts I think I've understood It sounds more like the resistors on the blower motor itself that may have failed #-o

Can anyone confirm that this is the likeliest problem just from my description above [-o<

Apologies for meddling :roll:
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Re: Xsara Heater stuck on full blast!

Post by Paul-R »

Not the resistors but the transistors. My old Xsara did exactly the same thing (maximum speed - all or nothing - no adjustment on speed) and then failed completely. A transistor kit and some time with a soldering iron fixed it.
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Skull
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Re: Xsara Heater stuck on full blast!

Post by Skull »

Thanks Paul-R I'll get the dash stuck back together and re-focus on the blower TRANSISTORS :wink: ....
On my 4th Citroën Xantia (X2 HDi (110))
Citroën sAXo Memphis Mk II
Gone
Xantia x3 (2.0i TCT Activa)(2.1 TD SX)(1.9 TD Estate)
Xsara HDi VTR Coupe / Saxo 1.1i / BX 1.9 d / 4 x AX's (1.4D /1.5D)
2 x 406 (1.9 TD Estate/2.1 TD Saloon) 405 1.9 D Estate 306 1.9 XTDT Hatch
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Paul-R
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Joined: 07 May 2009, 16:24
Location: Wirral, NW England; Vaucluse 84, France
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My Cars: 2015 1.6 Blue HDi 120 Peugeot 308 Active SW
2013 2.0 HDi 163 C5 Exclusive Tourer
2003 2.0 HDi 110 C5 Exclusive Estate (Gone)
2001 2.0 HDi 90 Xsara Estate (Gone)
x 1369

Re: Xsara Heater stuck on full blast!

Post by Paul-R »

Yes, I made the mistake of dismantling the heater control area first as well!
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson​
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