Do i have to flush the coolant system if i replace thermostat housing on my 03 ford focus?
Do i have to flush the coolant system if i replace thermostat housing on my 03 ford focus?
Added (1). Is air gonna stay in the system if i take out the thermostat housing? Is air gonna hurt anything?
After replacing the thermostat housing, you will want to bleed the coolant system just as if you had done a flush. Fill coolant to proper level, turn heat to full on position, run engine until hot, fill coolant to proper level again.
It would be a good time to, yes, but its not completely necessary. Just top the coolant off and let the air bleed by idling with the radiator cap off until the thermostat opens, then wait for the bubbling to stop
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