Thermostat cover and water pump will be in close proximity to each other at the front of the engine. Look where there is a junction where at least 3 major coolant hoses come together.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record