W202 2.5TD Coolant drain

[Tyro190]

Would someone please tell me where the engine block drain plug for the coolant is?

I need to replace the thermostat and would like to completely flush the system which, ideally, would mean the whole block.

Failing that, would a serious and long flush through the rad hoses be adequate?

 

[spock500]

Bottom right of the rad is a large plastic screw accessed from underneath, also nozzle to fit small piece of pipe for directing flow

 

[Tyro190]

Thanks for that Spock500 but I was after the position of the drain plug in the engine block itself.

I understand that to flush the system completely you need to drain the bottom of the block as well as the top and radiator.

 

[kwakdonut]

Would someone please tell me where the engine block drain plug for the coolant is?

I need to replace the thermostat and would like to completely flush the system which, ideally, would mean the whole block.

Failing that, would a serious and long flush through the rad hoses be adequate?

That's what I would do - flush it until water runs clear

 

[compress ignite]

Right hand (Starboard)side of Engine Block

Accessible from underneath,You'll get a "Face-Full" if not careful.
'Loosen with wrench,fit hose on nipple,fully loosen.

It's #12 in the Pictogram.
(Note: you' re "Looking" at it from the wrong side in the Pictogram,That's
why it's orifice in the block is portrayed in dotted lines.)

 

[Druk]

It's likely to be the same as the 102 and 103 engines. 19mm ring key with the open end cut off and a pipe extension over. The first time I did this it was very tight. The exhaust downpipe gets in the road.