Hook each one in turn to a source of 12 volts DC (a 10amp battery
charger will work fine), preferably with a fan blade attached, and see
how it runs. Fast and smooth is best, you can judge relative speed by
the noise (higher pitch = faster).
Note that the motor will jump when you first apply power. If spinning
fan blades don't bother you, you can hold it in your hand, otherwise
you'll need to arrange some sort of mount, preferably along the lines of
the original mount. Just clamping the motor housing in a vice may
distort the housing.
Randall
Patrick Bitton wrote:
>
> I have 3 heater blowers and don't know which one is the better one. Is there
> anyway to test the blower if it is completely out of the car?
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