Hey guys,


I noticed a little bit of coolant on my garage floor last night. My 300D is the only thing that's been parked in there in the past few days. I checked around the engine bay but didn't notice anything obvious. I know the previous owner had a new Behr radiator and a few other coolant components replaced, so I'm going to look at the records and see what exactly has been replaced.

Anyway, back when I had a Mustang that developed a coolant leak, I rented a coolant system pressure tester from Autozone. You'd screw this onto the coolant system via the cap, and pump pressure until your found your coolant squirting out.

Is this same type of tool useable on these cars? I feel like the only radiator cap type cap I've seen in my engine bay is the one on the coolant tank, but there is a little open ended hose that comes off of that, which I assumed was to drain over flow.

That would just leak the pressure, right? Should I just block it off? I've been reading and found plenty of people mentioning pressure testing these cars, but I cant find anything verifying how exactly to do it.

Any help is appreciated. Thanks!

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1984 Mercedes-Benz 300D