Thermostat Monitoring

Thermostat Monitoring

General description
After engine start and under the conditions:
- no hot engine
- ambient temperature within range
- normal driving
- sufficient mass air flow an increase of the coolant system temperature will be expected.

Monitor structure
If the engine coolant temperature does not reach a certain value under normal driving conditions and sufficient mass air flow, the coolant system is defective (see graph on next page).







Flow chart: