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that is the cooling fan relay.
Cooling fan should come on when coolant temperature exceeds 235 degrees Fahrenheit or A/C or defroster are turned on
The radiator fan will start to work once your engine reaches a certain operating temperature.
The sensor is located under the upper rad hose Directly below the hose is a sensor with 1 wire to it That is for the gauge Just behind and down from that is a sensor with 2 wires This is the fan sensor
Either the fan itself is bad or the fan sensor switch that tells the fan when to kick on is bad.
It is a two wire sensor, very near where the upper radiator hose attaches to the engine.
The coolant sensor on a 1994 Buick Roadmaster is located just above the Harmonic Balance pully at about 2 oclock
The 1996 Pontiac Grand Prix cooling fan sensor is located on the front of the engine. The fan sensor can be found just above the thermostat.
Cooling fan is designed to come on only when A/C, defrost, or engine temperature exceeds 235 degrees
Causes of overheating: Low/no coolant; cooling fan relay switch/sensor faulty; cooling fan motor faulty; thermostat stuck in closed position; water pump faulty.
Saturn Shop Foreman here. Cooling fan relay, bad temp sensor, open in fan motor, if you jump last two terminals in the diagnostic connector you should hear the relay click, you can put a test light across the fan plug to test the circuit after you have done this, hope this helps
In cooler weather, the fan(s) will take longer to energize, or maybe not at all, depending on the ambient temperature. How do you know that they sensors are good? Try turning on the AC to MAX and see if the fan goes on or not. Those fans also do have both relays and fuses - check them.