If that cold air return line is for some sort of internal cooling you could
have problems. I'll bet they put that there for a reason.
Just a thought.

Rob

At 01:58 PM 12/9/96 -0600, you wrote:
>Did some experimentation this weekend. I think you can
>avoid cutting a second hole in the face of your rear seat kickpanel by
>not installing the cold air return 
>inlet.
>
>I used some tape to close off my inlet and noticed
>no difference in the output of the furnace, nor any difference in the
>sound the furnace was making. 
>
>My theory is that cold air backflows through the 
>rear heater and squirrelcage fan; plenty of air
>is available to be heated by the furnace without supplying a new inlet
>vent.
>
>Later,
>
>Tom F.
>
>