Quote:
Originally Posted by Dead Parrot
Not sure when or why GM switched from return to radiator to return to water pump.
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The engine comes up to temp faster, because all of that extra water, and the heat-radiating effect of the passenger-side radiator reservoir, aren't in the loop. The engine comes up to operational temp faster, and the thermostat opens sooner, reducing the buildup of hot spots in the engine waiting for the thermostat to open.
But the OP doesn't want to do the improved routing apparently.