Receiver-Dehydrator; Condenser; Compressor Belt Tension Adjustment; Sight Glass Replacement - Chevrolet 10 1971 Series Chassis Service Manual

HEATER AND AIR CONDITIONING 1A-26
removal shows no evidence of contamination, replace
a like amount of fresh refrigeration oil into the com­
pressor before reinstallation.
to service the entire system because of excessive
contamination in the oil removed, install a full
charge of fresh refrigeration oil in the compressor.
2. Position compressor on the mounting bracket and
install all nuts, bolts and lock washers.
3. Install the connector assembly to the compressor
rear head, using new "O" rings coated with clean
refrigeration oil.
4. Connect the electrical lead to the coil and install
and adjust compressor belt.
5. Evacuate and charge the system.
6. Leak test the system and check for proper operation.

Compressor Belt Tension Adjustment

Adjust the compressor belt to the specifications shown
in the Tune-Up chart in the Engine Specification section
of this manual.
CONDENSER (Fig. 33)
Removal
1. Purge the system of refrigerant.
2. Disconnect the refrigerant lines at the condenser and
cap them.
3. Remove the hood catch assembly.
shroud mounting screws.
4. Remove radiator mounting bolts and push top of radi­
ator 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.
stalled at lower condenser mount bolts.
Fig. 33— Condenser and Receiver-Dehydrator
If it was necessary
Remove lower
Be certain shims are in­
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 once of refrigeration oil to the system
if a new condenser was installed. Charge the system
and check performance.

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.
the receiver-dehydrator.
The receiver-dehydrator is merely a moisture collect­
ing device and a refrigerant storage area and is the least
likely component of the system to cause a malfunction.
If at any time when examining the compressor oil,
moisture is found or there is an indication of moisture
at the expansion valve needle, the receiver-dehydrator
should be replaced as follows (fig. 33).
If the receiver-dehydrator is to be re­
NOTE:
used, cap the inlet and outlet connections imme­
diately. When installing a receiver-dehydrator,
do not uncap the connections until the last possi­
ble moment.
Removal
1. Disconnect battery ground cable.
2. Purge the system.
3. Remove the inlet and outlet connections from the
receiver-dehydrator.
4. Remove the receiver-dehydrator mounting bolts and
carefully remove it.
5. Cap the system if the receiver-dehydrator will not
be replaced immediately.
will be reused.
Installation
1. Place the receiver-dehydrator in position and re­
place attaching bolts.
immediately before connecting lines.
2. Uncap any previously capped connections and con­
nect the fittings using new "O" ring seals, coated
with clean refrigeration oil.
3. Evacuate and recharge the system. If a new receiver-
dehydrator was installed, add one fluid ounce refrig­
eration oil to the system.
4. Connect battery ground cable.

SIGHT GLASS REPLACEMENT

If damage to the sight glass should occur, a new sight
glass kit should be installed.
glass, seal and retainer. (See Figure 34).
1. Purge system.
2. Remove the sight glass retainer nut using a screw
driver and remove old glass and "O" ring seal.
3. Install the new glass and seal and retainer nut, being
careful not to turn the nut past the face of the housing.
To do so may damage the "O" ring seal.
4. Evacuate and recharge the system.
Do not attempt to repair
Cap the receiver if it
Do not uncap the unit until
The kit contains the sight
10-30 CHEVROLET TRUCK SERVICE MANUAL