Take the thermostat out and place in a pan of boiling water it should open fully in less than a minute and close just as quickly when removed.

When the new stat was installed did you run the engine until it opened and recheck the coolant level.

Sometimes the coolant will drop due to an air pocket in the head finally filling. One way to reduce this problem is to loosen the sending unit to let some air out when filling the cooling system.


1941 Chevy Master 3/4-Ton
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Born to fish, the truck is only a hobby.