Given the hot weather I am reminded of the alleged thick person who sat in front of the fridge with the door open to keep the room cool. As we (presumably) all know the fridge cools the inside and heats the surrounding air so the end result is the room not getting any cooler.
However a caravan fridge vents the hot air to the outside, and so in theory running the fridge with the door open should cool the interior of the caravan down (to some extent).
Discuss. :-)
Cheers
Dave R