try picking up a new fan relay + check fuse and module fan behind bumper
check fuse for cooling fan, or possibly temperature sensor at inlet.
Low on coolant or your sensor needs attention.
Temp sensor not working, cooling fan not working, blown head gasket.
Where is the IAT sensor in a peugeot 207
If by cooling system you mean the cooling fan, it takes a while for the coolant temperature to rise enough to trigger the temperature sensor that activates the fan. This is to help warm up the engine and to avoid unnecessary operation of the cooling fan when it is not needed.
unplug the temp sensor under the thermostat housing ,
Causes of overheating: Low/no coolant; cooling fan relay switch/sensor faulty; cooling fan motor faulty; thermostat stuck in closed position; water pump faulty.
The cooling fan light on your dash refers to the engine compartment cooling fan on the passenger's side of the vehicle, not the radiator cooling fan. In my experience with my '85 Mr2, that fan doesn't do a helluva lot, cuz mine only works if I unplug the temp sensor (sensor's dead and I don't wanna replace it) and I've never had a problem with overheating.
Firstly it's a polaris. Temp sensor, fan relay, fan motor, air in cooling system, thermostat, water pump, control box. Take your pick they all fail or cause overheating problems. Very annoying.
Overheating, yes. Loss of antifreeze, no.
Protects, no. The only temp sensor is the coolant temp sensor. The car will run until the engine is ruined if allowed to continue overheating.
The speed sensor on a Peugeot Boxer is on top of the gearbox. It is near the driver's side drive shaft inner CV.