On a Citroën Relay, the temperature sensor is typically located on or near the engine, often in the cooling system, such as in the coolant outlet or near the thermostat housing. Depending on the model year and engine type, it could also be situated on the cylinder head. For precise location, it's best to consult the vehicle's service manual or a repair guide specific to your model.
left mirror
Rh under mirror...
no,relay
it is in driver mirror
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The coolant temperature switch and the cooling fan relay (same thing) is usually located in the water outlet housing. It will be the bigger sensor, the smaller is the temperature gauge sensor.
The engine computer uses the signal from the coolant temperature sensor to decide when to activate the radiator fan relay.
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timing mark
inside the BSI