Evacuating And Charging Procedures; Air Conditioning System Capacity; Installing Charging Station To Check System Operation; Purging The System - Chevrolet CHEVY VAN G10 SERIES Service Manual

EVACUATING AND CHARGING PROCEDURES

AIR C O N D ITIO N IN G SYSTEM CAPACITY
C62
C62 & C 63
IN STALLING CHARGING STATIO N
SYSTEM OPERATION
1. The low pressure fitting is located on the connector
block (com pressor inlet line) and the high pressure fitting
on the m uffler (Fig. 24).
2. Install Gauge A dapters J-5420 and J-9459 onto the high
and low pressure gauge lines o f the Charging S tation.
3. With the engine stopped, remove the caps from the cored
valve gauge fittings.
4. Be certain all valves on Charging S tation are closed.
5. Connect high pressure gauge line to high pressure gauge
fitting.
6. See Figure 21. T urn high pressure co ntrol (2) one turn
counterclockw ise (open). Crack open low pressure co n­
trol (1) and allow refrigerant gas to hiss from low
pressure gauge line for three seconds, then connect low
pressure gauge line to low pressure gauge fitting.
7. System is now ready for purging or perform ance testing.

PURGING THE SYSTEM

In replacing any o f the air conditioning com ponents the
system m ust be com pletely purged or drained o f refrigerant.
MUFFLER
X —
______
COMPRESSOR
LO W PRESSURE
G A U G E
C H A R G IN G STATIO N
CONTROLS
Fig. 2 4 —Charging Schematic
Refrigerant Oil
Charge Charge
3 lbs. 4 oz. 10 oz.
5 lbs. 4 oz. 10 oz.
TO CHECK
.C O N N E C T O R
BLOCK
The purpose is to low er the pressure inside the system so th at
a com ponent p art can be safely removed.
1. With engine stopped, install high and low pressure lines
o f Charging S tation gauge set to the proper high and low
pressure gauge fittings. (See "Installing Charging S tation
to Check System O p eratio n .")
C A U T IO N : Before installing lines, be sure th at all
fo u r controls on the gauge set are closed.
2. D isconnect vacuum line at Charging S tatio n vacuum
pum p and put the line in a covered can as shown in
Figure 25.
N O T E : An em pty 3 lb. coffee can with a plastic
cover which has been cross-slit (Xed), to allow hose
en try, works well fo r this purpose.
3. Fully open high (2) and low (1) pressure control valves,
and allow refrigerant to purge from system at a rapid rate
into the covered can.
4. Oil loss will be m inim al. It may be added to the system
during evacuation as described later.
5. Tow ard the end o f the purge stage, Tool J-24095 should
be flushed w ith refrigerant to eliminate possible co n ­
tam ination.
a. D isconnect refrigerant line at supply tank.
b. Flush T ool J-24095 by cracking open valve on
refrigerant tan k . A fter, flushing for approxim ately
three seconds, close valve.
c. T em porarily refasten the tool.
d. R econnect refrigerant line to supply tank.
Fig. 2 5 —Collecting Refrigerant Oil During Purging
A IR C O N D IT IO N IN G 1A-17
C H E V Y V A N S H O P M A N U A L