When your engine is cold add coolant to the coolant reservoir so it is up to the cold
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Don't! Most cars have a reservoir for radiator coolant ... add liquid to the reservoir. Opening the radiator cap introduces air into the sealed system ... you don't want air bubbles in the cooling system.
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 )
Coolant reservoir, or directly in the radiator. If you are having to add much coolant, you need to find out why. Serious engine damage can occur if it is leaking inside the engine.
Remove the radiator cap and add it directly to the radiator. Then fill the overflow reservoir to the full mark.
Add the 50 / 50 mix of antifreeze and preferably distilled water to the engine coolant reservoir on the drivers side of the engine compartment ( carefull you don't put coolant in the windshield washer fluid reservoir - they are side by side ) or , if the engine is completely cool , you can remove the radiator cap and add directly to the radiator , and then re-install the radiator cap
You don't add coolant directly to the radiator, rather it goes into an overflow reservoir in the engine compartment. There will be a "min" or "max" line (or both) showing the proper level to be maintained. The reason we do not remove the radiator cap anymore is to keep the coolant system a sealed system so that no air can penetrate the coolant systems. By adding coolant through the reservoir (which has liquid in it already which is drawn from the bottom of that reservoir) we are not comprising the sealed system.
Fill both, but only remove the radiator cap when the engine has completely cooled off. Obviously have the water pump repaired as soon as possible.
To my knowledge, no car built on the CDW27 platform (Contours, Cougars, Mondeos, and Mystiques.) had a radiator plug, you add coolant directly to the coolant reservoir.
at the bottom of the coolant reservoir tank.
To put in more antifreeze in a 1995 Plymouth Voyager, located the reservoir near the radiator. Antifreeze is no longer added directly to the radiator. It is put into the plastic reservoir that is labeled radiator or coolant overflow.
The reservoir is usually considered to be the tank which holds coolant. It feeds the coolant into the radiator when needed, and receives coolant from the radiator as is necessary. This is where you check and maintain the coolant level. Make sure the cap is on quite tight.
On a 1996 Mercury Sable : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap