Chevrolet 10 Series 1968, Service Manual

Page: 56 / 713

HEATER AND AIR CONDITIONING 1A-25
2. Disconnect the refrigerant lines at the condenser and
cap them.
3. Remove the hood catch assembly. Remove lower
shroud mounting screws.
4. Remove radiator mounting bolts and push top of
radiator back enough to make lower condenser
mounting nuts accessible by reaching down between
radiator and radiator support.
5. Remove condenser attaching bolts and remove con­
denser (cap the condenser inlet and outlet if it is to
be reused).
Installation
1. Lower the replacement condenser into position and
replace mounting bolts. Be certain shims are in­
stalled at lower condenser mount bolts.
2. Move radiator into place and replace mounting bolts.
Replace shroud lower mounting screws.
3. Replace the hood catch assembly.
4. Connect the refrigerant lines, to the condenser using
new “ O” ring seals, coated with clean refrigeration
oil.
5. Add one fluid ounce of refrigeration oil to the system
if a new condenser was installed. Charge the system
and check performance.
40-60 Series
Rem oval
1. Purge the refrigerant from the system.
2. Drain the radiator.
3. Loosen the radiator hose clamps at the radiator
inlet and outlet and disconnect the hoses at the
radiator.
4. Remove the two upper radiator mounts.
5. Push the top of the fan shroud rearward and lift the
radiator out of the truck.
6. Disconnect the condenser inlet and outlet fittings and
cap the open pipes. If the condenser is to be reused,
cap the inlet and outlet pipes.
7. Remove the screws which attach the lower frame of
the condenser to the lower mounting brackets.
8. Remove the screws which attach the upper condenser
mounting brackets to the grille header bar and lift
the condenser out of the truck.
9. Remove the upper brackets from the condenser
frame if a new condenser will be installed.
Installation
1. Mount the upper condenser mounting brackets (loose­
ly) to the condenser frame.
2. Lower the condenser into position behind the grille.
3. Mount the upper condenser mounting brackets (loose­
ly) to the grille header bar.
4. Mount the condenser frame (firm ly) to the lower
condenser mounting brackets.
5. Tighten the upper condenser brackets to the con­
denser frame and grille header bar.
6. Uncap the refrigerant lines and condenser pipes
and connect the lines to the condenser using new
“ O” rings wetted with clean refrigeration oil.
7. Hold the top of the fan shroud rearward and lower
the radiator into place. Be certain that the rubber
pads are in place in the lower radiator mounts and
that the header tank flange seats squarely in the
pads.
8. Mount the two upper radiator mounts observing the
rubber pad location as in the previous step. Attach
the fan shroud to the rear of the mounts.
9. Connect the coolant hoses from the engine to the
radiator inlet and outlet. Clamp securely.
10. Check that the radiator drain plug (or valve) is
installed (or shut off).
11. Refill the cooling system.
12. Evacuate and recharge the refrigeration system.
If a new condenser was installed, add one fluid ounce
of refrigeration oil to the system before recharging.
Check system performance and leak test.
RECEIVER-DEHYDRATOR
The receiver-dehydrator should be replaced if it has
been damaged through an accident or if it leaks or be­
comes restricted or clogged. Do not attempt to repair
the receiver-dehydrator.
The receiver-dehydrator is merely a moisture collect-
ind device and a refrigerant storage area and is the least
likely component of the system to cause a malfunction.
Fig . 35—Condenser and Receiver Dehydrator
CHEVROLET TRUCK SERVICE MANUAL