Handling Refrigerant Tubes & Fittings

- All metal tubing lines should be free of dents or kinks to prevent loss of system capacity due to line restriction.
- The flexible hose lines should never be bent to a radius of less than four times the diameter of the hose.
- The flexible hose lines should never be allowed to come within a distance 63.5 mm (2 1/2 inches) of the exhaust manifold.
- Flexible hose lines should be inspected regularly for leaks or brittleness and replaced with new lines if deterioration or leaking is found.
- When disconnecting any fitting in the refrigeration system, the system must first be discharged of all R-134a. Refer to "Refrigerant Recovery And Recycling, Adding Oil, Evacuating And Recharging Procedures".
- Once a refrigerant line is opened to the atmosphere, it should be capped or taped immediately to prevent entry of moisture and dirt.
- Tighten all tubing connections to the specified torque for the fitting. Too little or too much torque when tightening can result in loose joints or deformed joint parts. Either condition can result in refrigerant leakage and an inoperative air conditioning system. Refer to "Fitting Tightening Specifications".
- O-rings and seats must be in perfect condition. A burr or piece of dirt may cause a refrigerant leak. Install new O-rings that have been lubricated with mineral base 525 viscosity refrigerant oil. DO NOT use PAG oil.
- Keep Polyalkylene Glycol (PAG) refrigerant oil off fitting threads. Long term contact of PAG oil on threads may cause future disassembly difficulties. Flush threads of fittings with mineral base 525 viscosity refrigerant oil.
- Do not use PAG oil. Do not wipe threads with a cloth.
- PAG oil will damage painted surfaces.