TR3driver
Great Pumpkin - R.I.P
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Which, oddly enough, is exactly what your Camaro did too. The big difference between the heaters is that the Camaro had a high capacity centrifugal blower for the heater, not the wimpy little fan in the Smiths unit. Plus a flow-through heater core design that didn't tend to trap any sediment in the system like the Smiths does. The fresh air intake certainly didn't hurt either, since much like the radiator, it gave the fan some help at higher speeds.The first look at my TR3 heater brought the Camaro lesson back to mind. Smiths tried to heat the air and then blow it downward.