It will depend on which engine you have. The 2.0 DOHC has 2 sensors; one for the temp gauge and one for the ECM. The temp sensors are both located on the thermostat housing; one is on top and one is on the bottom of the housing.
The Sensor on the bottom of the thermostat housing is for the temp guage. The other i believe may be for the fan but it does not match the sensor for the ECM. Ive been to autozone advanced auto and oreilly, the sensor for the ecm is different than the one on top of the thermostat housing
the sensor is located on the thermostat housing
thermostat housing on the side of the engine block
One sensor would be for your engine temperature gauge and the other sensor for the OBD II engine management system
Actually, the heat regulator for the engine is the thermostat. It closes off the coolant when the engine is cold and circulates more coolant when the engine is hot.
Your reservoir may be low. This will trigger the coolant light. It is often a malfunctioning sensor and nothing is actually wrong with the cooling system or coolant. It can be easily replaced. Alternatively you can leave it, but monitor your engine temperature and coolant level.
Coolant from radiator? Run engine to normal operating temperature -remove transmission dipstick and let a drop fall on hot part of engine, oil will "smoke" coolant will "sizzle" If so a bad radiator allow transmission fluid from cooler lines to get mixed with engine coolant
the back of the block
ford escort 1996 zetec the location of the water pump?
Follow the upper radiator hose to a plastic casing near the engine. It's inside. 3 nuts will need to be removed to access the housing.
Its an hexagonal plug below the exhaust manifold on the side of the engine.
Follow the coolant hose going from the thermostat housing to the firewall. You'll see two plugs attached to a metal tube connecting the two hoses. The coolant temp sensor is the large one with a square connector attached to it.
Use ethelyline glycol. The green stuff.