I bought this car about a month ago with an overheating problem it couldn't travel for 3 miles without overheating after replacing the thermostat and gasket. The previous owners cut away the thermostat and left the ring for the gasket.
After flushing the system completely and getting all kinds of junk/gunk out of it until it ran clear. I put the old piece and new gasket back in and it will run fine until it gets to a hill. Found out the water pump needed changed. Just got done changing it and switched to the new thermostat and it is back to overheating again after 3 miles. The system has been bled of air every time.
I am wondering what I should do now I have found no signs of a head gasket leak or water leaking anywhere. What should I do now? My mechanic and I are thinking two different things. They think a plugged radiator while I'm thinking the Temperature sensor switch. I'm about to go back to the cut up thermostat. Any thoughts?