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4cyl Coolant Sensor Locations84-87 Pontiac Fiero
 Coolant Fan SwitchLocated on the forward side of the engine. This switch screws into the cylinder head horizontally, next to the exhaust manifold.Temperature Gauge Sending UnitLocated on the top corner of the cylinder head. This sending unit screws into the cylinder head vertically, next to the thermostat housing and the valve cover.Coolant Temperature Sensor (for the ECM)Located in the thermostat housing. This sensor screws into the thermostat housing.
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