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Old 05-04-2020, 08:46 PM   #6
ls1ac
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Garage
RZNT4R Is running on the right track. Just to reiterate: A bubble in the engine will expand and push the coolant out. A method called vacuum fill will pull most of the air out and suck coolant in. This is the preferred method on new cars. Usually cycling the engine to temperature about six or 10 times will solve the problem. When you do this have the heater on.


edit: If you did a really poor job of filling there could be air around the thermostat and it will not let the thermostat open. There is a very small bleed hole that is designed to let air pass but it can take some time and the engine will usually get hot.
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