> But with a vertical radiator where the upper reservoir (header tank) is
> across the top there is the possibility that the cooling system fill gets
> low and the temp switch is not covered with coolant and although there is
> still enough coolant to keep up with the heat load the fan switch may not
> function properly. In this case the upper hose is a better location.
Or the lower tank.
On cross-flow systems, I have looked into the suction side tank and seen it
almost empty, on a car that was not having any cooling problems. There was
still water flow through over 3/4 of the tubes.
Randall
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