2nd Gen Non-Engine/Transmission Heater vent control not working

[Rescue Ram]

Evening all,

Today I replaced a couple dead instrument panel lights, including one behind the heater control (upper bulb) on my '96 (a/c equipped). On the way to Wal-Mart, I noticed the vaccum hissing from behind the panel, and realized the vents were stuck in the defrost position. The knob moves freely. Hopefully I will have time to tear it apart tomorrow; but in the meantime, any ideas or suggestions on how to troubleshoot it would be greatly appreciated. I am visiting my mom in St. Augustine, FL, and naturally forgot to bring my service manual. I would like to get this fixed before I go back to the snow country.



Thanks in advance,

Brian Z.

 

[parcher]

Simple, You knocked the vaccuum line off the back of the control head. Defrost is the default position. Heater control snd suto trans cruise control are why our trucks have a vaccuum pump.