PeachParts Mercedes-Benz Forum - View Single Post - 87 300SDL no heat, and also engine never warms up

mplafleur · #10 01-16-2010, 06:32 PM

Get a clean bucket, bowl, or other cantainer that can hold about 1-1/2 to 2 gallons of coolant.

1. With container underneath, use screwdriver to open radiator drain plug. (blue plug on driver bottom)
2. Remove expansion tank cap.
3. Remove tube from airbox to the turbocharger.
4. After drained, use 10mm socket to remove lower bolt on thermostat housing.
5. Remove upper bolt on thermostat housing.
6. Remove thermostat housing from the cylinder head. The housing can stay connected to the hose.
7. Remove thermostat within the housing.
8. Insert new thermostat (there is a notch to make sure it is oriented correctly) and make sure you use a new gasket as it does the sealing between the housing and the head. The round plate with the slots cut in it goes toward the cylinder head. This will restrict coolant flow when the thermostat opens.
9. Install bolts and air tube.
10. Make sure the radiator drain plug is tight.
11. Fill coolant from top radiator hose first into cylinder head and reconnect when full.
12. Fill expansion tank with coolant and replace cap.
13. Have an adult beverage of your choice.