It'll work fine. BTDT.
Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Bill M
Sent: Tuesday, August 28, 2012 11:55 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Heater question

My 87 has a box with both ports on it but the fresh air holes are blocked. I
ended up using an early 87 box and swapped to the fresh air ports. I am
thinking of swapping the pass side back to the metered air for my wife. She
always has the fresh air turned off. I just don't know if it will throw the
box's air balance off somehow.

Bill

On Aug 28, 2012, at 10:40 AM, mark drillock <mdrillock@COX.NET> wrote:

> The key is the large hose connections on both sides of the box. The
> original fresh only side air boxes have round connections for the
> large hose on each side and these connect very near the front of the
> van. The later boxes with side heat use oval connections for the large
> hose on each side and these connect to the box area farthest from the
> front of the van.
>
> The original set of side connections is in front of the heater core,
> fresh only. The other set is behind the heater core, so when the core
> is warmed the side vent air is warmed.
>
> Many later boxes have both position connections available but the pair
> not used are sealed up. To switch from one connection point to the
> other means different hoses, at least in the case of wanting to use
> the oval heated air ports. These heated ports are in tight areas of
> the dash that require special molded elbows to adapt from the oval box
> ports to the round vent hoses.
>
> The switch from fresh only to heated side vents occurred during the
> 1987 production year. Early 87 uses the old hose connection points
> while later 87 made the switch.
>
> Mark
>
> Frank Condelli wrote:
>>         Does anyone know how to tell the difference between the front
heater boxes that have heat output to the side vents in the dash and the
ones that do not ?  What can I see from the outside of the box that would
tell the difference ?
>>
>>
>>
>>
>> Cheers,
>>