Inner fender
Check the hose from the radiator on the passenger side of the engine. It is in the housing where it meets the engine. facing the engine,it is on the lower part of the block,passenger side.
Follow the lower radiator hose from the radiator. It should connect to the water pump on the engine.
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
The thermostat on a 4.7L is located where the lower radiator hose hooks the engine. The thermostat is located under the housing where the lower radiator hose hooks to the block.
It is on the rear, passenger side of the engine.
Follow the lower radiator hose to the engine, it is there.
The petcock is located on the passenger engine side of the radiator. It doesn't extend outward from the radiator; it's actually inset to it. Turning it counter clockwise opens it.
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It is on the passenger side of the engine bay between the radiator and engine. it is housed in a assembly in the radiator hoses. find the lower radiator hose at the radiator and follow it to a housing that connects the radiator hoses. The thermostat is in side
Try Following the hose comming out of the passenger side of the radiator. It ends up near the bottom of the engine block. Its behind the screwd on housing.
You fill it from the overflow jug located on the passenger side of the engine compartment
The radiator is located in the front of the engine compartment. The water tank reservoir is mounted to the firewall on the passenger side of the engine compartment.