Engine/Transmission (1998.5 - 2002) Lost ac to cab vents

[Blankenheim]

Cleaning truck and installing exterior vent filters. After installation, I have no ac in dashboard vents. Have ac in windshield vents. Fan works. What did I do????:{
I removed vent filters and problem is still there.
Blankenheim

 

[RustyJC]

You've probably knocked a vacuum line loose somewhere. With no vacuum available to the heat & A/C controls, the system will fail-safe to the defrost position.

Rusty

 

[JR]

Look for the small 1/8"? vacuum line running up to the firewall. One line runs up from the vac pump into a manifold right at the firewall and I believe 3 lines come off of that, for HVAC controls and one goes to the transfer case for the 4wheel drive actuator.

 

[Blankenheim]

thanks for the help. was easy to find,the only shiny hose there.