The coolant thermostat for the Mercedes GLE W167 OM654 diesel is a map-controlled electronic thermostat, allowing the ECU to vary engine operating temperature for optimal efficiency. A failed thermostat causes overheating or permanent cold running. This integrated housing unit includes all gaskets.

1. 1
2. Allow engine to cool
3. 2
4. Drain coolant
5. 3
6. Remove intake manifold cover
7. 4
8. Locate thermostat housing on front of engine block
9. 5
10. Disconnect coolant hoses
11. 6
12. Disconnect thermostat electrical connector
13. 7
14. Remove 3 housing bolts
15. 8
16. Install new housing with new gasket
17. 9
18. Reconnect hoses and electrical
19. 10
20. Refill and bleed cooling system.