THERE IS ACTUALLY A TANK ON THE PASSENGER SIDE OF THE CAR IT WILL BE A YELLOWISH COLOR THAT IS WHERE YOU WANT TO FILL UP YOUR COOLANT IF YOU NEED TO.
The thread on cap on the engine coolant reservoir is the " radiator cap " on a 1995 Mercury Grand Marquis
On a 1997 Mercury Grand Marquis : The thread on cap on the engine coolant reservoir is the 16 PSI pressure cap / radiator cap
On a 1997 Mercury Grand Marquis : The thread on cap on the engine coolant reservoir is your 16 PSI pressure cap / radiator cap
The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap for the engine cooling system
ummm,try unscrewing it?
On a 2002 Mercury Cougar : No , the thread on cap on your engine coolant reservoir is the pressure cap / radiator cap
The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap on a 1999 Mercury Mystique
On a 1996 Mercury Grand Marquis : ( the thread on cap on your engine coolant reservoir is the pressure cap / radiator cap ) The vehicle came from the factory with a 50 / 50 mix of distilled water and GREEN antifreeze ( meeting Ford specification ESE-M97B44-A ) Besides providing freeze protection the mixture also provides CORROSION protection ( until the corrosion package in the antifreeze is " used up " ) Ford states to not let the antifreeze portion of the mixture to drop below 40 % and not to exceed 60 %
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
If you dont see the petcock, then pull the bottom hose to the radiator; remove radiator cap or remove cap from the fill antifreeze expansion add-to tank reservoir. I think this will remove any air lock and drain out faster.
It will be the modulator on the distributor cap. They have a history of doing just that. Fix it before you ruin your tranni like I did.