At 07:18 PM 7/11/2013, Trevor Reynolds wrote:
>So I've replaced my front heater core and 
>fan;  All done with dash completely 
>re-installed. During the work I tested the fan 
>before installing and thought I had been careful 
>to install it properly.  Don't think there is 
>any way to install fan upside down but very 
>possible that I wired the fan backwards.  Lots 
>of spinning when I switch it on but little to no 
>air flowing.  Vents all manipulated and seem to 
>work.  If I mis-wired that fan would it turn 
>backwards?  �And bigger question, if I exchange 
>the hot with the ground can I make the thing 
>work properly?  Is that resistor capable of 
>working if I switch the wires.  I feel horrible 
>and dread tearing it all apart to rewire a single connector.

Not likely you wired it backwards but if you did 
reversing the wires externally should take care of it.

The fan will blow air whichever direction it 
spins, but it will blow more air when spinning in the right direction.

What's more likely is that one or both of the 
free-hanging flap doors that let ram air bypass 
the fan is jammed open or has fallen off 
completely.  They are unfortunately designed to 
fail, and you may have precipitated an incipient 
failure when you were in there.

Also unfortunately I don't know any way to deal 
with them other than opening up the box.  The 
faint glimmer of sunshine is that ram air will still work just fine.

Yours,
David