GMC chevrolet camaro 2000 Service Manual page 189

1-92 Heating, Ventilation and Air Conditioning
HVAC
" Tighten all of the tubing connections to the
specified torque.
Too much or too little torque may result in the
following conditions:
- Loose joints
- Deformed joint parts
- Refrigerant leakage
- An inoperative A/C system
.. Ensure that the 0-rings and the seats are in
perfect condition.
A burr or a piece of dirt may cause a
refrigerant leak.
.. Install new 0-rings that you have lubricated with
the mineral base 525 viscosity refrigerant oil.
Do not use polyalkylene glycol (PAG) synthetic oil.
Do not wipe the threads with a cloth.
.. Keep PAG synthetic refrigerant oil off fitting
threads. Long term contact of PAG synthetic
oil on threads may cause future disassembly
difficulties. Flush threads of fitting with mineral
base 525 viscosity refrigerant oil. Do not use PAG
synthetic oil. Do not wipe threads with a cloth.
Handling A/C Compressor
Do not strike, drop, or turn the compressor upside
down. If the compressor is knocked over or turned
upside down, rot.ate the compressor's clutch 5-6 ti.mes
by hand to circulate the oil which has settled in the
cylinder. Sudden rotating with oil in the cylinder
can cause valve damage and adversely affect
durability.
Maintaining Chemical Stability
The chemical stability of the refrigeration system plays
an important role in the efficient operation and
longevity of the A/C system.
When air, moisture or particulate contamination are
introduced into the refrigeration system, the following
results will occur: · · ·
" The chemical stability of R-134a and polyalkylene
glycol (PAG) synthetic lubricant will change. ·
" The pressure/temperature symmetry will change,
O
The A/C system efficiency will be diminished.
" lnternalA/C system parts may corrode and/or
wear in an abnormal manner.
Use the following general practices to maintain
chemical stability in the refrigeration system:
• Wipe away dirt and/or oil before you break a
refrigerant connection. This will reduce the
possibility of particulate contamination.
.. Cap, plug or tape both sides of an open
connection as soon as possible. This will minimize
the amount of dirt and moisture entering the
system.
" Ensure that the following remain clean and dry:
- The tools being used for the repair
- The surrounding area of the repair
- The hoses and connectors for the ACR4
machine or manifold gage set
- The replacement parts
• When adding polyalkylene glycol (PAG) lubricant,
ensure the transfer device and the container
remain clean and dry to minimize moisture
intrusion.
• Do not· ,eave the A/C system open any longer
.than necessary.
• Before recharging an A/C system that has been
opened, properly evacuate and vacuum test·
the system.
• Service parts are dehydrated and sealed prior to
shipping. Retain the parts in their sealed
packages until you are ready to use them.
• Ensure the parts are at room temperature before (
opening the packages. This prevents condensation
on the parts from humidity in the atmosphere.
• Attach the A/C service equipment quick-connects
as soon as possible after removing the
service caps.
Refrigerant Oil Distribution
Notice: Use only Polyalkylene Glycol Synthetic
Refrigerant Oil (PAG) for internal circulation through
the R-134a A/C system and only 525 viscosity mineral
oil on fitting threads and 0-rings. If lubricants other ·
than those specified are used, compressor failure
and/or fitting seizure may result.
The following informations should be used to service
the air conditioning (A/C) system:
• A/C system internal lubricant (including
compressor) use GM P/N 12345923 or equivalent.
• A/C system 0-ring and fitting lubricant use
GM P/N 12301108 or equivalent.