Changed water pump,thermostat,radiatorcap,coolant temp sensor,and had mechanic test it,he got all air out of system,and said there are no leaks,the van overheats intermittently,and right before it overheats I loose heat inside of the van .what is going on. Mechanic thought he fixed it by getting all of the air out of coolant but did not work....I am at a loss. What is the problem
My car has 178000 miles.
My car has an automatic transmission.
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