Quote:
Originally Posted by wwotr
They always told me in HS Auto Shop, that by turning on the Heater, the anti-freeze would flow through all the tubing/Heater Core.
Sounds ridiculous now, but I took it as "Gospel" from Mr. Norris back in 74!
Roger
"RATIKLE"
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Mr. Norris was right on. You need to run it - preferrably with the heater on (hoses open so coolant flows) - to 'burp' it. When I was trained in at the garage I used to work at I was told you need to burp the system.
By running it until the thermostat opens with the heater on you eventually remove all the air from the system. Air compresses, water does not. An air bubble in the system could stay there and eventually lead to an overheat condition. The air bubble gets around the thermostat but without having the thermostat in coolant, it doesn't open. The engine gets hotter and hotter and hotter and bye-bye head gasket(s).
Plus if you've ever ran a car that wasn't burped in -30 degree air temps you'll quickly find out that no heat sucks.
I burp all my vehicles when doing maintenance that includes draining the coolant.