79 C30 hvac vacuum line diagram

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K5King

K5King

Junior Member
Joined
Dec 11, 2024
Posts
2
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4
Location
Cameron, OK
First Name
Tracey
Truck Year
1979
Truck Model
C30
Engine Size
454
hey all, I have a 79 C30 dually and after having it apart for over a year and then putting back together I am confident that I have the HVAC vacuum lines inside wrong. The diagram I found in the posted service manual doesnt match whats is inside my cab either. any help?
 

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