Ok so I hope this isn't what I think it is. I was driving today and the temp was already high on the dash then some accident caused me to sit while cars were stopped. Temp reached 120 and right when I was able to finally stop I hear a pop and saw coolant leaking and the car shut down. I'm at work right now so I can't check it. It wasn't a lot of coolant maybe a liter or so.

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1990 190E 3.0L