electrical problem

All of a sudden my heater fan has stopped working on speeds 1, 2 and 3
though it works on 4. Is this a faulty switch and is replacement difficult?
or is there wiring common to the three speeds but not the fourth?

Thanks guys

 

I'm no expert on pugs in particular, but his sounds like a resistor pack has
blown (1,2,3 are fed through a resistor to slow the fan 4 is direct feed)

 

Thanks Thomas. Sounds like a garage job then . Do you think it will be
expensive?

 

It depends on the model, if the resistor pack is easily acessable under the
bonnet, thaen the only problem is getting parts, but if it is behind the
dash, it will be more compicated/costly

Someone else on this group will prob know this fault better than me!

 

Hi Bob
Tom is correct in his diagnosis - the resistor is faulty.
You do not mention which Peugeot you have, but I have changed the resistor
on 406 and 605. Both are quite easy.
Remove the panel above the front passenger footwell, and you should see the
heater blower motor. A black (?) box fastened with 1 or 2 screws to the edge
of the motor mounting is the culprit. Loosen and remove plug - that's it.
The downside is that you are unlikely to get the resistor from anywhere else
then a Peugeot dealer.

IPG

 

Many thanks Ivar. Mine's a 206. I suppose it will be the same set up.

 

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On the 205 at least, the motor speed is controlled by a transistor
regulator, the switch connects different resistors to it for the
different speeds. For full speed though, the switch just short circuits
the transistor, because there is no need for it with its loss & heat
dissipation.

What you describe happens when the transistor fails, it is open circuit
so the fan does not run except when the fan is at full speed.

Again, on the 205 at least, the transistor is on a circuit board within
the fan assembly, it can be removed from below the fan and replaced.

Car buffs get a good board from a car scrap yard. Electronics buffs
instead replace the transistor with anything suitable.

For more details see earlier threads, such as:

<http://groups.google.com/groups?threadm=PYCCgtG+4C4$oAM$@pillar.
turnpike.com>

Regards