You don't need the car running to do a compression test, you turn the motor by hand.

There is no point to starting it up to flush the coolant if the water pump isn't turning. Just flush it as best you can with the motor off.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22