Selector Duct And Heater Core R E P La Ce M E N - GMC 1986 P-Truck Service Manual

♦«" Install or Connect (Figures 4 and 33)
1. Expansion tube seal (o-ring) to the core inlet line.
• Use new seal (o-ring) coated with clean
refrieration oil.
• Insert the short screen and end of the orifice
into the evaporator inlet line.
2. Expansion tube to the evaporator core inlet line.
3. C o n de n ser to the e vap o ra to r line at the
evaporator inlet.
4. Evacuate, charge and check the system.
SELECTOR DUCT AND HEATER
CORE REPLACEMENT
Remove or Disconnect (Figures 34 and 35)
1. Battery ground cable.
2. Drain the radiator.
Figure 36—Actuator-Plenum Side Vent
10. Selector duct assembly.
11. Vacuum and electrical harness.
12. Selector duct assembly.
13. Core mounting strap screws.
14. Core.
AIR CONDITIONING
3. Heater hoses from the core tubes (148).
• Plug the core tubes to prevent spillage.
4. Instrument panel compartment and door.
5. Center duct to the selector duct (200).
6. Center lower and center upper ducts.
7. Temperature door cable.
8. Nuts from the three selector duct studs that
project into the dash panel.
9. Selector duct to dash panel screw (inside the
vehicle).
• Pull rearward until the core tubes clear the
dash panel.
• Lower the selector assembly to reach the
vacuum and electrical harness.
1B-37