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Where is the radiator fan temperature switch on a peugeot 406 p reg 2.1 diesel?

1. Underneath the plastic cover that runs along the top of the radiator between the top hose and the filler cap.

2. Unclip and remove this cover (on the 406 it clips into place), located to the left hand side of the expansion tank.

3. You will then see a switch and wire (usually green or brown).