Hello people!!! When changing the top fan switch, it was one with completely wrong values and not original Opel installed, therefore also the problems with the too early starting 2nd stage of the fan, at least after replacement of the switch, I let the engine run for a while, to see if the fan now does its service correctly. I noticed that the thick black cable, which goes on the plus pole of the battery, gets damn hot. So hot that already the plastic de r battery cover melted. I removed it for fire protection reasons!!! Once too long prepared on the metal piece of the cable….Fire bubble at the paw!!! The pole itself is not hot, “only” the cable at the front of the metal piece. What can that be again???? Thank you for your tips!! Greeting Jörn