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As slow speed, the motor works less hard, and develops less heat.  So the fan is responsible for pulling air thru the radiator.

 

By tilting the radiator backwards, you've created (in effect) a wedge.  The air that would normally be forced by speed thru the radiator now can be diverted upwards and over the radiator.  The fins of the radiator also don't help with this effect, as they too are angled, thereby furthering the blockage of normal wind-aided cooling. 

 

at least that's my theory.


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