Hello. My father has a 1990 W124 200E (same as mine). During the summer, he often is in tailback, so the temperature goes up to about 100°C and the temperature sensor turns on the fan through a relay.
I would like to install an "override" switch, so that he can manually turn on the fan, even if the temperature limit hasn't reached.
I think I should install the switch to provide a +12V, or a ground, or a short, to a specific point of the electrical system.
I didn't understand if that fan is the "auxiliary fan" mentioned in the car electrical schematics...
Any advice?
cheatman