The default position for the vacuum control system is defrost. That means, if there is no vacuum to the system to change the air settings, it goes to defrost. The vacuum lines for this system are small plastic (1/8" thick) lines of various colors ie; red, blue, green, black etc. The feed line will come from the intake manifold or a junction on the firewall and I believe it will be red. Find this tube and verify vacuum and that are no cracks or splits. This feed line goes directly to the selector switch on the dash. Check for vacuum at the switch and that it is going through it to the various damper controls. Hope this helps.
SPONSORED LINKS
Friday, November 7th, 2008 AT 9:16 PM