2005 W24 Worhorse - no dash air/vent/heat

[Dixster]

I have a 2005 Winnebago 38J on a W24 Workhorse chassis.

The entire dash air/heat/vent/fans have stopped working.
No air comes through any of the vents at any time.

All the fuses I could find are checking good. At road speed we
get no air movement through any of the vents no matter which
mode we select.

Is there a vacuum operated valve some where that controls
the entire system ?

Any other thought would be greatly appreciated. Thanks in advance.

[n0ukf]

In my '97 Adventurer ('96 Chevy) I was getting airflow but no heat. Turned out a section of vacuum line was missing. After fixing that I now have heat but no AC but that's due to a refrigerant leak somewhere.

[Dixster]

With the member provided information and help
I was able to find the problem. Turned out to be a
defective vacuum module. Now to recharge the AC.
With out a vacuum pump the charging really goes slow.

Again thanks for all the member help and concern.

[Khuuff]

Where was the defective module, I am having a similar situation

[Dixster]

In the diagram I replaced the master vacuum module - when the vents
didn't open nothing would work - unit is in the plenum - a messy job.