My 02 Cadillac deville temperature gauge
shows a reading when i first turn the ignition
on and it keeps saying check coolant but the
coolant is full .....Im totally lost any
answers? It has a Northstar Engine
Check the float device on the coolant reservoir, it may be bad or stuck reading low level
pressure test the cooling system- maybe it is something as simple as a bad radiator cap- but MAYBE.................
Our Deville did the same thing, it was just the sensor in the tank.