More then likely your head gasket is gone but it could also be a problem in the coolent tank
there is no real radiator cap. On the left side of engine compartment there is a coolant jug. This where you would add coolant to radiator.
It would be on the coolant reservoir.
Its either in the coolant overflow tank or in the side of the radiator
Radiator full and coolant recovery tank filled to mark Radiator full and coolant recovery tank filled to mark
There is no radiator cap on a 1999 Ford Contour. The cap to the coolant overflow reservior is the only way to add something to the radiator.
Should be at the bottom of the radiator.
The 1999 Ford Taurus does not have a radiator cap. Coolant is added by using the over flow bottle instead of a radiator cap.
If you have a 1999 Passat V6, the coolant temperature sensor is located in the lower radiator hose.
The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap on a 1999 Mercury Mystique
Lower passenger side of radiator, motor side.
You don't have a cap on the radiator. The cap is located directly on the coolant bottle
on top of the coolant resivoir