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Originally Posted by ScottyS
Isn't the water pump run by the timing belt on your car? It is on the 2.2's & 2.5's. The only things on the accessory belts are the alternator, power steering, and AC, I think. Underdrive pulley should have zero effect on the water pump...
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Winner winner, chicken dinner.
The cooling system isn't stressed on your WRX, not by a bit. But peace of mind is worth a lot, so don't feel bad about upgrades like the upper radiator shroud, Redline Water Wetter or equivalent, and runn a 'leaner' coolant mix in the summer. The thermostat and replacement radiator are overkill really. You know the output of the more prevalent trackwhoring SECCS members' cars, and the conditions they run them in (meaning August heat at Lovelock and Fernley) and I can't think of anybody even mentioning slightly elevated cooling temps.