K 3500 Truck 4WD V8-454 7.4L VIN J SFI (1996)
Hose/Line HVAC: Service Precautions
Proper O-Ring Installation
Improper O-Ring Installation
IMPORTANT
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Before opening the refrigeration system to the atmosphere, make sure the work area is well ventilated. Welding or steam-cleaning operations
should not be done on or near refrigeration system lines or other air conditioning parts on the vehicle.
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All metal tubing lines should be free of dents or kinks to prevent loss of system capacity due to line restriction.
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The flexible hose lines should never be bent to a radius of less than four times the diameter of the hose.
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The flexible hose lines should never be allowed to come within a distance of 6.5 mm (2.5 inches) of the exhaust manifold.
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Flexible hose lines should be inspected regularly for leaks or brittleness and replaced with new lines if deterioration or leaking is found.
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When disconnecting any fitting in the refrigerant system, the system must be discharged of all Refrigerant-134a. However, proceed very
cautiously, regardless of the gage readings. Open very slowly, keeping your face and hands away so that no injury can occur, If pressure is noticed
when a fitting is loosened, allow it to bleed off very slowly.
NOTICE: Alcohol should never be used In the refrigeration system In an attempt to remove moisture. Damage to system components could occur.
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If any refrigerant line is opened to the atmosphere, it should be immediately capped to prevent the entrance of moisture and dirt. These
contaminants can cause internal compressor wear or plugged lines in the condenser and evaporator core and expansion (orifice) tubes or
compressor inlet screens.
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Remove sealing caps from subassemblies just before making connections for final assembly. Use a small amount of clean 525 viscosity refrigerant
oil on all tube and hose joints. Use new O-ring seals dipped in 525 viscosity refrigerant oil when assembling joints. The oil will aid in assembly
and help to provide a leakproof joint. O-ring seals and seats must be in perfect condition because a burr or a piece of dirt can cause a refrigerant
