Coolant flow

Heat travels to lesser heat.

Try standing outside on a 10° day. The 98.6° heat in your body will easily move to the outside air temp of 10° (F).

Now try standing Outside on a 90° day. Any body heat over your 98.6° body temp is going to have a hard time excaping from your body.

This is a overheating situation, same applies to cars.....

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