GMC 1986 P-Truck Service Manual page 80

47
\
Port
Connection
No.
Source
Bi Level
Heat/Defrost
OSA/REC
AC Mode
Ports 1,6,7 & 8 Not Used (Sealed On Vacuum Hose Assembly)
45. Vacuum Source - Engine
46. Vacuum Tank - Gas
47. Cowl
52. Control
53. Actuator
45
46
1
/
r
z
Select Lever Valve Operation Chart
Max A/C Norm A/C Bi-Level
Off
4 Vacuum Vacuum
9 Vacuum
Vent
3 Vacuum Vacuum
2 Vent Vacuum
5 Vent Vacuum
Vacuum Line - Tan (Source)
E. Vacuum Line - Gray (Bi Level)
H.
Vacuum Line - Dark Blue (A/C)
K.
Vacuum Line - Red (Heat/Defrost)
F.
Vacuum Line - Orange (Recirculate)
Figure 17—G A/C Vacuum Schematic
AIR CONDITIONING
j" 1 ^
J
53 53
K
/
Vent
Vacuum Vacuum Vacuum
Vacuum
Vacuum Vacuum
Vacuum Vacuum Vacuum
Vent Vent Vent
Vacuum
Vent Vent
1B-17
53
l
1
f
Heat Defrost
Vacuum Vacuum
Vacuum Vent
Vacuum
Vent
Vent Vent
Vent Vent
B-06944