Ventilation temperature regulation failure

[Pontstone]

Hi all,
I have a problem with my Octavia TDI from 1999
with air conditioning (not Climatronic). that´s getting more and more annoying the more the spring sun is shining.

A few months ago, I turned the temperature knob to maximum
heat, and now the ventilation temperature stays at maximum
even though I turn the knob to "cold". I checked the knob and
the wires leading to it, and they seem to be ok. I now suspect
that something is wrong with the heater package under the
dash board.

So... to my question....
Has any of you had this problem with your Octavia?
What was the cause of the problem?
Is it worth the while to dismantle the dash on my own (I am a fairly
good mechanic), or is it better to leave it to a professional (considering
the AC unit)?

I would appreciate any tips I can get... it´s getting warmer and
warmer here in Sweden....

Thanks in advance!

[ap0gee]

Flap motor is the obvious thing...???

[KenONeill]

Flap motor, linkage or control switch.

If you feel confident about working on a non-a/c system, go for it. There's no need to touch the a/c refrigerant circuit.