Here is a good link for troubleshooting this problem.
http://www.thesamba.com/vw/forum/archive/index.php/o-t--t-295888--.html

There is a faq on how to adjust the cables somewhere, I can't seem to
find my copy.
I had to adjust the flapper valve cable under the chassis if I remember
correctly.

If I can fing that "how to" I'll send it.

cheers,

chris

81 vw caddy
86 syncro
87 transport

Donna Skarloken wrote:
> All you can do is slide everything to "off."  Somebody else can explain it
> better than me but one of your cables is likely kinked and stuck; you have
> get underneath and redo it/them.
>
> This has happened to me many times in my 87 Wolfsburg til my dad finally got
> it fixed.  Drove to LA and back in June years ago for the big VW show w/out
> air and the darn heater stuck on.  Now that I'm older I swear I can't take
> the heat anymore; makes me literally ill.  I paid something like $1200 to
> fix the a/c in my Syncro - lots of dough but worth it to me.
>
> Good luck - was already 80+ when I got to work this morning in Sacramento.
>
> Donna, 87 Syncro
>
> On Tue, May 13, 2008 at 8:05 PM, Slloth <slloth@comcast.net> wrote:
>
>
>> No matter how I have my front heater controls set I always have warm air
>> coming from under the dash.  Is there a way to stop this till I have
>> time to figure out whats not set up right?  I really don't need any heat
>> tomorrow when it's 90 degrees outside! (California)
>>
>> --
>> '84 Westfalia, 1.9L
>> '73 FJ40, 2F
>>
>>
>
>
>