Baught a e200 w124 94 model in mint condition. Just one problem, the aux fan starts blowing fullspeed after 5min driving, or after parking in the sun. The temp runs to cold below 75'C, the AC works very good though. Replaced the engine loom, but still no change. In the morning all seems fine. As soon as the HVAC system is unplugged the fan stops, but unplug all else the fan stil go full speed. Help please