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The "radiator" cap is located on the coolant reservoir.
The thread on cap for your engine coolant reservoir is the pressure cap / radiator cap ( the engine coolant reservoir is located on the drivers side of the engine compartment , near the firewall )
A lot of vehicles don't have the radiator cap on the radiator , they use a thread on style cap on the engine coolant reservoir ( that is the pressure cap / radiator cap )
On a 2003 Ford Thunderbird : The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap The engine coolant reservoir is in the engine compartment , on the drivers side of the engine compartment , near the firewall . You can see the cap on the reservoir through a hole in the " trim "
On a 2004 Ford Freestar : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
On the coolant reservoir. This is a plastic reservoir toward the back right of the engine compartment.
On a 1998 Ford Taurus : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
On a 2003 Ford Explorer : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
On a 2000 Lincoln LS : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap * the engine coolant reservoir is in the engine compartment , on the drivers side of the engine compartment , next to the firewall , you can see the cap through a hole in the " trim "
Normally in the coolant reservoir recovery tank. If you have the supercharged model it is located on the radiator beneath the filler cap and oil cooler lines.
The radiator cap could be the cause of coolant reservoir overflow or backup. Have the cap checked to see if it is bad.
A pressurized coolant reservoir would have a thread on cap which acts as the " rad " cap