W123 radiators usually have a drain plug on the left hand side of the radiator (LHS => as though you are sitting in the car looking out the front) and there is a drain on the block on OM616 and OM617 engines on the right hand side - sorry I don't know about petrol engines - but you've got a diesel haven't you? ('cos this is the diesel forum I see I guess this info helps).

Can you stick your car info in your posts or in your signature?

EDIT - oh sorry I see you've found the radiator drain. The hook thing just stops the drain plug from flowing away with the coolant.

On a non turbo OM617 the block drain plug is easy to reach - I guess with a turbo it is harder to get to but you don't need to take off the wheel. The drain is about halfway along the block at about the same height as the starter solenoid.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!