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Re: serpentine setup
The cooling system isn't a reverse flow system as you stated. This much is true.
HOWEVER the water pump turns in the OPPOSITE direction than the crank because of the routing of the belt thus giving you a REVERSE ROTATION WATER PUMP from the old school multi-belt system.Your belt should run in an "S" or a REVERSED "S" arond the crank and water pump then onto the rest of the accessories like alt, p/s, a/c, a/p, idlers & tensioners.
If you were to open up the two different water pumps you would see that the impellers inside them face each other instead of both facing the same way. Put the wrong pump on and your in for a mell-uva-hess-of troubles.
Under the proper applications they both force coolant into the engine from the radiator via the lower Rad hose and out of the engine back to the radiator via the thermostat & upper hose. Unlike a true reverse flow system that has the exit to the radiator located at the lower hose with the thermostat there as well. the old F*** Ranger/Bronco II's with the 2.8/2.9L engines are a prime example.
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