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Old 09-14-2003, 04:17 PM
r129 300sl r129 300sl is offline
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Join Date: Jul 2003
Location: UK
Posts: 47
I had a coolant leak on my M103 engine as well. I initially thought it was water pump but it turned out to be the small hose at the back of the engine that goes inside the car. (The one connected to the lifting hook at the back of the engine).

Found it out by pressure testing the system.

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