Indispensable in extreme conditions, this fan ensures more air, better cooling and maximum performance. It's in your own hands: The digital control allows you to adjust the switch-on temperature to the present conditions and to read off the current temperature at any time. The switch-on temperature can be set anywhere between 65°C and 95°C. The switch-off temperature is set automatically, and is always 1°C below the switch-on temperature.For installation on all models, you will need the auxiliary wiring harness 77711979000; for additional switching, the Y-distributor 77711979044 can also be installed.