heater fan running in reverse

[Icehouse]

Has anyone had that problem? HAHA Mine does for some reason. I didn't realize why until I had some duct tape I used to hold the door in defrost mode, I had the door down because my window was clear. When I turned the heater on it sucked the tape that was hanging down into the heater...WTF! It's a Bluebird heater box which looks the same as a 68 and since mine was messed up I just swapped an NOS core I had in and hooked up the wires. The plug fit and all seemed fine until I turned it on in the car and noticed it's sucking air instead of blowing it..... Which wouldn't be such a big deal if it wasn't freezing cold out! How am I supposed to daily drive the gobstopper car if I have to be moving to defrost my window. It's almost as bad as a VW bug!

[INDY510]

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My electric fans on the radiator will spin backwards if the wires are backwards..... . . but that might hurt your NOS fan

[datzenmike]

JDM are positive ground.???Swap the wires, it's a DC motor and will run the other way if you reverse polarity.

[datsun65]

I used to own a 64 Datsun that originally was positive ground, but I switched the car over to negative ground.

 

Same thing happened, the fan ran in reverse.

 

Try swapping the wires?

[Icehouse]

Yeah I know I can reverse the wires just thought it was kinda odd that using all factory crap and it's doing that... Weird...