Chevrolet 1977 light duty truck, Руководство по обслуживанию

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Fig. IB -3 6 -Blower Evaporator (C-K Models)
2. Disconnect the condenser to evaporator line at
the evaporator inlet. C ap the open line at once.
3. Using needle-nose pliers, remove the expansion
tube from the evap o rato r core inlet line (fig. IB-37).
4. Remove the expansion tube " O " ring from the
core inlet line.
5. To install, reverse Steps 1-4 above.
NOTE: Install the expansion tube using a new " 0 "
ring coated with clean
refrigeration oil, by
inserting the short screen end o f the tube into the
evaporator inlet line.
6. Evacuate, charge and check the system.
SELECTOR D U C T A N D HEATER CORE
ASSEMBLY
Replacem ent (Figs. IB -3 8 and IB -3 9 )
N O T E : Use new " O " rings, coated with clean
re grigeration oil, when connecting refrig eran t
lines.
Be sure cover to case and dash panel sealer is intact
before reinstalling cover.
9. Evacuate, charge and check the system.
E X P A N S IO N TU B E
The expansion tube is located in the e v ap o rato r core
inlet line.
Replacem ent (Fig. IB - 3 7 )
l. Purge the system o f refrigerant.
1. Disconnect the battery g round cable.
2. D ra in the ra d iato r and remove the heater hoses
from the core tubes. Plug the core tubes to prevent
coolant spillage du rin g removal.
3. Remove the glove box and door as an assembly.
4. Remove the center duct to selector duct and
instrum ent panel screws and remove the center lower
and center upper ducts.
5. Disconnect the bowden cable at the tem perature
door.
6. Remove the nuts from the three selector duct
studs projecting through the dash panel.
7. Remove the selector duct to dash panel screw
(inside vehicle).
8. Pull the selector duct assembly rearw ard until
the core tubes clear the dash panel. Lower the selector
assembly fa r enough to gain access to all vacuum and
electrical harnesses.
Fig. 1 B-37-E xpansion Tube - Typical
Fig. IB-38- Heater Hose Routings (C-K Models)