Do you have heat to the dash vents? If so, it�s a 90 or 91 heater.

The defroster hose is paper and about 30-35 mm diameter. 

Hooks onto the round fitting adjacent to #14 in the parts illustration: http://www.vagcat.com/epc/cat/vw/T2/1988/78/49/881783/

The later heater has the vent outlets on part #2 of the above linked illustration whereas on the early heater they�re located on part #1 as shown.

Jim

Never to wrong others takes one a long way towards peace of mind.
-- Seneca

On Apr 15, 2014, at 6:07 PM, Karl Wolz <wolzphoto@Q.COM> wrote:

> The heater box has been replaced. Possibly from different year?
> 
> Karl Wolz
> Sent from my electronic umbilicus
> 
>> On Apr 14, 2014, at 5:24 PM, Jim Arnott <jrasite@eoni.com> wrote:
>> 
>> Pictures: https://plus.google.com/photos/104201992525683280598/albums/6002305290408371697?banner=pwa
>> 
>> 
>> 
>>> On Apr 14, 2014, at 8:40 AM, Karl Wolz <wolzphoto@Q.COM> wrote:
>>> 
>>> Looking forward to your photographic art.
>>