OK, the wiring harness is still on the suspect list, but I can still not find out why it should work flawless nine months a year and struggle when a few degrees warmer?
Last nite I found a hint on a Norwegian MB-site where someone was asking about a little fan in the area to the right of the passengers feet? It should be running all the time and blowing the air upwards to the dash speaker area. They assumed it to be something for the climate control.
My question is if someone out there know if this might be the "missing fan" to cool the computer compartment behind the battery??
IŽll look for it later, but it should be good to know a little more before I start dismantling the car...