Change the electric fan control on Citroën C4 II

Using a lamp, check the rotation of the engine fan through the grille.

Cold engine and ignition off: no rotation

Engine started and air conditioning off: no rotation

Engine started and air conditioning on: slow rotation speed

very hot engine: high speed rotation (noisy fan)

Diagnosis with manufacturer's case (done by a Citroën garage): alarm present: motor-fan speed inconsistency

The sensor is located under the fan cover

You need to remove the 4 clips from the top

Then you will have to use the flexibility of the hood and the grille (because the attachment between the clipped grille and there is a risk of breaking the plastic tabs)

Disassembly of the 4 plastic clips

Gently slide a flathead screwdriver under the clip

Lift the central part

Lift the clip to remove it

Lift the hood

Unclip the cover on one side

Rotate to remove the plastic cover

Using a flat screwdriver, lift the communication connector locking system.

Remove the connector by pulling on it

Using a ratchet and a torx bit, unscrew the sensor fixing screw

Remove the sensor from its housing

Using a flat screwdriver or small pliers, move the yellow part that serves as a lock for the connector.

Using a flat screwdriver, lift the 2nd locking system

Disconnect the electrical connector by pulling on it

Compare the 2 connectors between the 2 sensors

the position of the connectors does not matter (as in the photo)

Check that the sensor has the same dimension

the hole for the fixing screw and the clips for the plastic cover

Reconnect the 2 connectors

Check that the connectors are properly locked

Push the 2nd lock back onto the power connector to complete the lock.

Insert the sensor into its housing

Screw the sensor into its housing with the torx screw

Replace the plastic cover around the FRIC sensor

Put the plastic cover back in place

Replace the 4 plastic rivets

Using a lamp, check that the fan is working properly (same as step 1)

Or redo a diagnosis in a garage