PEUGEOT BIPPER Handbook page 133

TOWING A TRAILER, CARAVAN, ETC...
Driving advice
A towed vehicle must free wheel: gearbox in
neutral.
Cooling: towing a trailer on a slope
increases the coolant temperature.
As the fan is electrically controlled, its
cooling capacity is not dependent on the
engine speed.
On the contrary, use a high gear to lower the
engine speed and reduce your speed.
Towing a trailer
In all cases, pay attention to the coolant
temperature.
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