Xsara Heater stuck on full blast!

jaynay · Post by **jaynay** » 12 Jan 2006, 12:39

Hello. The heater in my 2002 1.4lx Xsara is stuck on full blast. Turning off the fan speed knob has no effect whatsoever. Air conditioning and temperature controls seem to be working fine, it just seems to be a problem with regulating the air flow. Have spent a lot of money on the car in the past year - new radiator, new ball joints - and I don't really want to fork out a lot of money again to get something else fixed. I don't know anything about cars, but I'm fairly practically minded. So how do I go about investigating/repairing this problem? How difficult/time consuming/expensive would this be?

AndersDK · Post by **AndersDK** » 12 Jan 2006, 14:13

What happens if you turn off the A/C ? - still full blast on blower ?

Post by **Peter.N.** » 12 Jan 2006, 16:01

If the blower motor is the same as the Xantia, the regulator transistors have probably gone short circuit.

jaynay · Post by **jaynay** » 12 Jan 2006, 18:02

Problem is the same if air conditioning is switched off. Air still on full blast.

Stuart McB · Post by **Stuart McB** » 12 Jan 2006, 21:06

Sounds like the blower motor resistor may have packed in.

AndersDK · Post by **AndersDK** » 12 Jan 2006, 21:18

Right then. AFAIR the speed module power transistors are built onto the motor unit itself on these later models.
In line with above suggestions. Power transistors shorted out.

Try the search function. I seem to remember that we had a thread where suitable DIY power transistor types (from your local radioshack) were mentioned.

If you know how to use a soldering iron its a quick repair - but getting the blower motor out is a completely different story. Usually it resides at the (cabin) end of the air intake duct - meaning a fairly complicated disassembly job.

wheeler · Post by **wheeler** » 12 Jan 2006, 21:55

the heater motor on a xsara is very easy to remove.just remove the carpet panel under the glovebox & the motor is up there just held in by three screws.
as already said it is likely the transistor pack in the motor at fault,this is sometimes available seperately.there is also a chance it could be the A/C ecu,to rule this out disconect it & see if it makes any difference if the motor stops then its the A/C ecu if not then likely the transistor pack in the motor. the A/C ecu is located in the same area as the motor,if you look up & to the o/s of the car it is a small grey box with a 15 pin connector on it.

Post by **Peter.N.** » 12 Jan 2006, 23:23

I did list suitable transistors............somewhere!

zzf00l · Post by **zzf00l** » 14 Jan 2006, 10:21

http://www.andyspares.com/discussionfor ... C_ID=14658

zzf00l · Post by **zzf00l** » 14 Jan 2006, 10:23

Oh Well!! So much for the database.... thats where a complete transistor change was logged including supply of transistors etc. Perhaps our Moderators can work some magic?

Post by **Peter.N.** » 14 Jan 2006, 12:53

If nothing turns up, I will look them up again..........

Clogzz · Post by **Clogzz** » 14 Jan 2006, 13:41

Found it:

http://www.frenchcarforum.co.uk/forum/v ... hp?t=16965

zzf00l · Post by **zzf00l** » 14 Jan 2006, 14:36

Or try 'Farnell in one', its an Internet site which gave exceptional service.. cheap too (less than a tenner anyway). Took a couple of hours to remove blower, replace transistors and refit....hate to think how much a dealer would charge because of course they would just replace the whole blower assembly.

http://www.farnell.com/

Post by **Peter.N.** » 14 Jan 2006, 15:15

Well done clogzz!

Clogzz · Post by **Clogzz** » 14 Jan 2006, 15:31

Hi Peter,

Thank you for the compliment.
It wasn't difficult to find the list because I had saved it in the computer for when my turn comes to blow the transistors.
So I had the topic title, making for a very easy search.

Regards,
Terry.