WD Catalog 2018

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Component Repair or
Replacement
• Tips on Component Repair or Replacement
• Servicing the Compressor
• HVAC Control SystemVariations—Troubleshooting
• Servicing and Repairing the Heater
• Summary
Tips on Replacing & Repairing AC Components
The following service and repair procedures are not any different than typical
vehicle service work. However, AC system parts are made of soft metals
(copper, aluminum, brass, etc.). The comments and tips that follow will make
your job easier.
CAUTION All of the service procedures described are only per-
formed after the AC system refrigerant has been re-
covered. Never use regular shop oil or joint compound
to lubricate or seal any AC connections.
Note: To help prevent air, moisture or debris from entering
an open system, cap or plug open lines, fittings or
components as soon as they are disconnected. Keep
all connections (also the caps or plugs you might use)
clean so no debris can accidentally get inside the
system.
As a general rule inAC service, replace any gaskets and O-rings with new ones.
Use fresh refrigeration oil to lubricate connections, gaskets and O-rings. The
following parts are discussed further in this section:
1. Hoses and Fittings
2. Lines
3. Expansion Valves
4. Expansion Tubes
5. Receiver-Drier and Accumulator
6. Compressor & Clutch
1. Hoses and Fittings
When replacing hoses be sure to use the same type and ID hose you
removed. When hoses or fittings are shielded or clamped to prevent
vibration damage, be sure these are in position or secured. On R-134a
systems make sure replacement hose has been designed for this refriger-
ant.
10
Chapter
10-1
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