A mechanic told me to replace water pump (leak) and thermostat cover (seeping) at $675. But their invoice has nothing about pressue test.
Because the coolant level drop is slow in my car, I wondered how they could see the leak.

I had another mechanic pressue test my coolant system. The result: no leak.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.