Ventilation only up and down! why?
 

Hello people! I'm new and have been the first to ask :-(!
Yesterday my air was still normal and now it only blows up and down but not forward! because someone has an idea what the problem may be?
can to my data: My vehicle is a Seville STS 9.4 Liter, production in 1993, I live in Austria and there are unfortunately not too many Caddy driver, I hope you read my English :-) Thanks for your answers already. Greeting Alec

Hello people! I found the problem :-)
The ventilation is controlled automatically by depression!
Yesterday I changed the spark plugs and am probably arrived on such a hose, as this was already very fragile, I have given him the rest, have this replaced with another and see as the ventilation is working again!
Maybe I could help one or another of the same problem?
Anything else, and that this depression hose on the driver's side and the rear cylinder bank, about 15 inches long black hose.

Greeting Alec