Hello dear community, my Chevy has a problem with the engine cooling. The two fans behind the cooler run only in the first stage. This makes the engine very hot. I already had the following done: Thermostat exchanged Cooler fan relays exchanged Temperature sensor/sensor exchanged Lambda probe replaced Cable break found and eliminated motor control unit sent in and checked/no errors Temperature display on the tester and in the dashboard ok Air conditioning on fans run n immediately switch on via tester manually no error message about tester Me and my workshop are in despair. Does any of you have another idea? I am grateful about every hint. Greeting Henryk