So I recently noticed With my 85 pickup 22R that the coolant reservoir is pretty full and my radiator is somewhat low . The truck is not overheating, coolant is not coming out of anywhere or overflowing , the only thing I’m seeing is coolant filling the reservoir and the radiator being low. I changed the cap already , and it’s doing the same thing. Is this normal and am I just overreacting or is there an issue somewhere ? Again the truck does not overheat and doesn’t skip a beat but the coolant filling the reservoir is odd to me . Perhaps T stat not allowing the coolant to flow back into the radiator ? This engine is fairly fresh and was sitting most of the time .. thank you