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1.- Make sure engine is cool

2.- Open coolant reservoir

3.- Place a BIG clean pan to pick up the leaking coolant (when you remove the thermostat Housing)

4.- Remove the thermostat housing (2 or 3 bolts?)

5.- Remove old thermostat(gasket?)

6.- Place new thermostat the same way the old one was(gasket?)

7.-Screw back on the housing (2 or 3 bolts?)

There is a small pinhole on the thermostat that assists in evacuating air in the system. Make sure the thermostat is oriented in such a manner that the pinhole is at the highest position of the housing.

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12y ago
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15y ago

It's on top of the water pump. You need an O gasket with the new thermostat.

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15y ago

I have a M-B 300TE 6 Cyl gas. The thermostat is on the upper radiator hose cap that connects to the engine. Be sure engine is cold.

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12y ago

How do I change my thermostat in my 1998 ml 320

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Q: How do you change thermostat on a 2002 Mercedes ml320?
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