Q: Changed water pump ,radiator cap,coolant temp sensor,thermostat,got vehicle checked for any leaks, still overheats 2001 Oldsmobile Silhouette

asked by on December 17, 2016

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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