Do you drill an 1/8" hole in the thermostat to help air travel to the highest place ? I, also, have an Air Lift tool to put the entire system in a vacuum and that then pulls the coolant in. Leaving the system under vacuum for an hour will reveal if there is a leak too, that can then be addressed without needing to drain the system again.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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