My 93-190E had a problem with the radiator/coolant and I hope somebody can give me good advice.

4 months ago, I found my 190E coolant is losing very quickly. The service guy told me the water pump was not working and he replaced it. It worked well until a few days ago, the problem reappeared. This time the problem seems more obvious. After the engine stop running for a few minutes, I can see the coolant drips away from the bottom of the car (I couldn't locate where it is leaking) like it is running from a tap!

What could be the reason for this? Rusty radiator inside? The problem doesn't seem to happen when the engine is running. Really hope to get some expert advice.

Thanks