yes - have the car pressure tested - maybe the thermo is hot at where the sender is...maybe something must be clogged - u feeling cold coolant by the water pump? When u squeeze it, can u feel water?? Did u open the radiator and actually add water to it by using a funnel into the top inlet? do this now. Can u add water? Then run it with the header cap off to release the air. Does this new radiator use a radiator cap??