The reason behind why increasing flow in an automobile can cause it to overheat is this. First when you increase flow you transfer more of the engine's heat to the water. Since you haven't changed the radiator or the air flow over it, the radiator can't handle the extra heat being transfered. It's size and the airflow limit how much heat it can remove from the water. When you excede the limit of the radiator the water just continues to heat up until it's boiling point is reached. Overheating.
I think it's a bad analogy because of this:
Car: 125,000 Watt heat source --> 900 cubic inch radiator
PC: 70 Watt heat source --> 70 cubic inch radiator
AND
A car has a different design goal for the cooling system.
Ever had a car that didn't run right until it warmed up?
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