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t stat change; isn't there a vent on the block. on 1998 Mercury Villager

when changeing the t stat isnt there a vent on the block to be cracked during refill?

Asked by for the 1998 Mercury Villager
Not necessarily, you can just fill the car and then run it and then 'burp' the system. Sometimes I fill up the system and then I drive the car until the temp gauge becomes stable, which is a sign that the system has burped. Then I top off the system.