Hope it helped (sorry for the mixup, dunno where I came up with '71?). Learn something every day, I never knew a heater core could also be called an evaporator. At any rate it's my understanding that some trucks have the heater hose going to the water pump. Couldn't say why, or what difference it makes. Mine is the way it left the factory.
Just ran across this while doing a search:
Quote:
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Automatic and A/C trucks returned to the radiator for better overall cooling and base trucks returned to the pump for quicker warmup.
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