whirring/ticking noise in footwell, 1998 406 estate

Have read postings on this in the past, but can't remember the answers, or
find them.

My 406 started making a whirring and ticking noise (constantly) from the
passenger footwell yesterday. The ticking (almost like a plastic cog
jumping) seems louder today. Sounds like some kind of motor in the
ventilation/aircon system? It does not seem to be affected in any way by any
of the ventilation controls/buttons.

What is it, and how do you fix it?
thanks,
John

 

John R wrote in message ...

Suspect either the air mixing flap motor or the re-circulate flap motor.
The fault can be a stuck flap, a faulty feedback sensor on the servo or I
have had a fault in the servo control amplifier on the air mixing flap
control.
The first should be fixable by removing the offending motor and gearbox from
the heater body and manually freeing the flap.
On my 405, the mixer flap motor is on the RHS footwell as you sit in the car
and the re-ciruclate motor is in the LHS footwell.
The feedback sensor is in the gearbox and not a replaceable part. Replace
motor and gearbox.
Diagnosing a fault in the control amplifier needs expert electronic
knowledge and a module replacement is likely to be expensive. Hopefully this
is the least likely cause.

regards

Bob

 

99% of the time it is a faulty recirc motor, and will require
replacing. A bit of a fiddly job (a couple of small screws hold it
in), and a dealer will probably charge an hour or so to do. It's up
behind the glovebox, and it's not absolutely necessary to remove the
glovebox to do it, but it does make life easier if it is out of the
way.

 

Not sure I'm prepared to pay to get it fixed. Reckon I can live without it.
Which wire do I cut to shut the thing up?

 

First make SURE that it is the recirc motor which is noisy. Then make
sure the flap to the outside is open. You can check this by lifting
the pollen filter. Then just disconnect the plug to the motor.