Pontiac tempest 1968 Service Manual page 28

1A-1
CUSTOM AIR CONDITIONER
COMPONENT REPLACEMENT AND ADJUSTMENT
CONTENTS OF THIS SECTION
SUBJECT PAGE SUBJECT
PAGE
Evacuate Charge and Operational Check . . .
1A- -2
Control Assembly - Replace. . . . . . . . . 1A -39
Checking and Adding Compressor O i l . . .
1A- -8
. .
a
. 1A -39
Compressor Assembly Remove and Replace .
1A- -9
Blower Speed Switch
. . . .
1A -40
Compressor Assembly Overhaul . . . . . .
1A- •16 . . . .
1A -40
1A- • 14 Master Switch . . . . . . . . . . . . . . • . . lA- -40
1A- -10
Blower Motor Resistor. „ . . . .
a
. . . . . lA- -40
1A- •29
. 1A- -41
1A- •29
. . . . 1A--42
1A- •29 Master Relay . . . . . . . . . . . . . , . . . 1A--42
1A-•30 . . . . 1A--42
1A- •31 , . . . 1A--42
1A- •31
Diverter» . .
a
. . . .
1A- •42
Air Inlet and Valve Assy. - Replace . . . .
1A- •32
. , . 1A-•42
Blower Motor, Impeller or Inlet Duct . . . .
1A- •32
. . . 1A- •43
A / C Heater Core or Case - Replace . . . .
1A- •32 Cold Air Duct, . . . . . . .
, . .
0
1A- •43
Cam Assembly - Temp. Door - Adjust
Defroster Duct
. . . . . . . . . . . . . . . . 1A-•44
1A- -36
Outlet Nozzle Right or Left . . . . . . . . . 1A-•44
1A- •36
Upper A i r Outlet and Nozzle. . . . . . . . •
1A-•44
1A- •39
. . . . 1A-•44
Defroster Cable. . . . . • •
1A- •39
. . . . 1A-45
PRECAUTIONARY SERVICE MEASURES
Before any service is attempted which requires
opening of refrigeration pipes or units, the person
doing the work should be thoroughly familiar with
the material in the Diagnosis Manual - Basic Air
Conditioning Information. Also, he should follow
very carefully the instructions given on the following
pages for the unit being serviced.
The major reasons behind these measures are for
safety and to prevent dirt and moisture from getting
into system,. Dirt contaminant is apt to cause leaky
valves or wear in the compressor, and moisture will
freeze into ice at expansion valve and freeze valve
stem.
The presence of moisture can also cause the for­
mation of hydrochloric or hydrofluoric acids in the
system.
REFRIGERATION SUB-ASSEMBLIES
l
a
All sub-assemblies are shipped, sealed and de­
hydrated. They are to remain sealed until just prior
to making connections.
2, All sub-assemblies should be at room tempera­
ture before uncapping. (This prevents condensation
of moisture from the air that enters the system.)
3. If, for any reason, caps are removed but the
connections are not made, then the tubes and other
parts should not remain unsealed for more than 15
minutes. Reseal connections if period is to be long­
er. This applies particularly to partially built-up
systems that will be left overnight.
4. Compressors are shipped with 10-11 oz. of
Frigidaire 525 viscosity oil and charged with a
mixture of Refrigerant-12 and dry nitrogen to pro­
vide an internal pressure at slightly above atmos­
pheric pressure.
ASSEMBLY
1. All precautions should be taken to prevent dam­
age to fittings or connections. Even minute damage
to a connection could cause it to leak.
2. Any fittings getting grease or dirt on them
should be wiped clean with a cloth dampened with
alcohol. Do not use chlorinated solvents such as
trichloroethylene for a cleaning agent, as they are
contaminants. If dirt, grease or moisture gets inside
pipes and cannot be removed, pipe is to be replaced.
3. Sealing caps should be removed from sub­
assemblies just prior to making connections for
final assembly.
4. Use a small amount of clean refrigeration oil
(525 or 1000 viscosity) on all tube and hose
joints, and dip the O-ring gasket in this oil before