i flushed my h22 cooling system last week! i started the car to warn it up and it had a bad idle! i then revesed it to a level spot on my drive way and bled the cooling system at the thrmostat housing. instantly the bad idle smoothed out!
there must be an air pocket that forms due to the position and angles of hoses housings etc... it must affect the idle control valve cos it needs to know when it gets hotter to back down the rpm.
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