Mad climate control

[Gavinrat]

I'm completely new to SVXs having bought mine a 92 model at an auction a fortnight ago. Its a great car but it has few problems that I'd like to resolve, the most annoying being the climate control.

Basically the temperature control part of the climate control seems to have a mind of its own. Apart from the temperature problem it seems to function perfectly.

In normal use the temperature control defaults to the maximum setpoint (32 degrees C in the UK). After it has been adjusted to the correct temperature (about 22 degrees C) the setpoint then climbs in half degree stages to the maximum again.
Occassionally it works correctly and maintains the set temperature and occassionally it automatically adjusts itself up or down by a couple of degrees or adjusts itself to the minimum setting (18 degrees C).

Has anyone suffered similar problems and did they ever find the cause. At the moment a fix that works most of the time is to set the temperature then jam a piece of paper in the temperature switch to hold it in the down position.

Any help and advice would be appreciated.