If it is leaking coolant. And you changed the thermostat. I would then move to this section. Flush the radiator and the heater core. This can be done at a certified shop with a reliable mechanic.
Instantly. If someone is telling you otherwise, they're blowing smoke.
i think that it is determined by the position of the sun. cheers-rhys stannard 10DL
Purg The Air Out of the Cooling system
Depending on the engine, the coolant temperature in a Cadillac could be from 180 to 195 degrees. The thermostat can be changed to give a lower or higher temp reading.
Have you replaced the thermostat?
you have an airlock
water pump. thermostat.
a new heater core
You might have bad actuator that opens and closes airways.
Check the Blender door... Also check the temp knobs they make be broken.
Sounds like thermostat is not opening and needs replacing
How did you change the thermostat?