either your radiator is leaking,head gaskit is leaking if it's your head gaskit leaking you will have water in your oil or water coming out your exhaust pipe,or you might have a freeze plug going bad.
On a 2003 Mercury Sable : The thread on cap on the engine coolant reservoir is the 16 PSI pressure cap / radiator cap
On a 2002 Mercury Sable : The thread on cap on your engine coolant reservoir is the 16 PSI pressure cap / radiator cap
On a 1996 Mercury Sable : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
In a 2000 Mercury Sable : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
The thread on cap on the engine coolant reservoir of a 2002 Mercury Sable is the pressure cap / radiator cap
On a 2001 Mercury Sable : The thread on cap on the engine coolant reservoir ( located in your engine compartment , on the passenger side of the engine compartment ) is the pressure cap / radiator cap
On a 2002 Mercury Sable the radiator is at the front of the engine compartment
To flush the radiator of a 2002 Mercury Sable, first ensure the engine is cool and then remove the radiator cap. Place a drain pan under the radiator, open the drain valve, and let the old coolant drain out completely. Rinse the radiator by adding water, running the engine for a few minutes, and then draining it again. Finally, refill the radiator with a proper mix of new coolant and distilled water.
On a 2002 Mercury Sable : The engine coolant reservoir is at the front of the engine compartment , on the passenger side of the engine compartment ( the engine coolant reservoir has a thread on cap on it , that is your pressure cap / radiator cap )
The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
The coolant temperature sending unit on a 97 Mercury Sable is in the engine compartment. It is located on the intake manifold.
front of the motor