Engine overheating

Okay, but if it’s a head gasket and after changing the radiator, CTS and bleeding the system, I developed an air pocket in front of the sensor. Why did it work when I changed the computer? How did the air pocket disappear just by changing the computer?

Well Roy, you are not going to believe this one! I have a friend here that is probably the top notch mechanic in the entire area. He was having some health issues so I couldn't get the car back in to him to run his Autel computer on it. Like I said the car was running very good and when it was registering very high temperature it just did not seem like it was overheating. Finally I was able to get the car to him and he ran it monitoring the temperature. We let the car run and it buried temperature in the red but he said it was only like 220 then the fans kicked on properly. So he said that I needed to buy a GM coolant temperature sensor and he ordered me one. I picked it up yesterday and switch out the one I bought from AutoZone and the darn car started working properly after almost two months of agony! So if you get this problem on older GM's especially the 3.1 six cylinder tell them to purchase a GM coolant temperature sensor. He said their a special switch inside the GM sensor and they are not in the aftermarket parts. The aftermarket sensor was sending the wrong temperature reading to my gauges. It actually was never overheating at all it just said the car was! So no blown head gasket no air bubble just an aftermarket sensor. Can you believe that one!

Hey Roy helping a friend on a 2002 honda civic 1.7/1.8 engine and his coolant temperature sensor is a two wire will pulling the connector while engine is running start the fan to eliminate!