I would be grateful for some pointers about the erratic operation of the interior ventilation fan in my 1986 S2 505 SLi wagon.
When I first use the car, the interior fan runs quite ok, but it can suddenly stop working sometime later. You can still get some ram fed air through the interior vents when driving along, but nothing when stopped. This can happen when the air con is on - I hope it is not damaging the air con when this happens. It is a frustrating nuisance, especially on hot days.
The volume of air tends to diminish when I don't actively have my foot on the accelerator, & when stopped at the lights the fan will blow air at the right amount for the slider setting for a time & then change to a much diminished flow.
I guess that the voltage feed to the fan motor is varying more than it should. I have had these same sort of problems with 504's % 405's. Can anyone give me some clues??