Pete :
There is one slot in my kitchen to put a fridge/freezer and on the side of
it is a radiator.

Would turning the radiator on in the kitchen damage the fridge or cause it
to upset it thermostat or doodahs ?

Our fridge/freezer has been working like that for fourteen years and
counting, no problem. I have taken precautions, though. There's a sheet
of expanded polystyrene between the side of the f/f and the radiator.
And there's another sheet on top of that one, leaning over so that its
top rests against the wall. As a result the back half of the radiator
isn't heating the room very well, but the front half is.

--
Mike Barnes