While replacing my thermostat today in my 1995 Honda Civic, I drained out all of the old coolant through the drain plug. By the time all of the coolant had been emptied there was about 4 litres of it in the drain pan. After installing the new thermostat I filled up the cooling system with distilled …

Steam coming from radiator cap after coolant not draining properly

Tester June 22, 2019, 3:52pm 2

If you didn’t open the bleed bolt when adding coolant air got trapped in the cooling system.

This prevents completely filling the cooling system and air gets trapped.

Tester

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