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Q:

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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when changeing the t stat isnt there a vent on the block to be cracked during refill?
(1) Answer
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.