Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Refrigerant Lines



See Figure 1

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Fig. Fig. 1: A/C refrigerant pipe fittings

Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

When installing air conditioning components in the vehicle, the refrigerant pipes must be connected as the final stage of the operation. Remove the seal caps just before connecting the pipe to the air conditioning component.

  1. Use a flare nut and backup wrench to loosen the air conditioning pipe fittings. If the fitting does not loosen on the first attempt, soak the area with refrigerant oil and let stand for 15 minutes. Slowly loosen the fitting. If the fitting binds, retighten. Go back and forth while lubricating until the fitting loosens.
  3. Remove the refrigerant pipe from the vehicle.

Always plug all open refrigerant pipes to prevent moisture from entering the system. An air tight system is good, moisture in the system is BAD.

To install:
  1. Install the pipe with new O-rings lubricated with refrigerant oil only. Do not use any other type of oil. This will contaminate the air conditioning system.
  3. After inserting the tube into the union until the O-ring is no longer visible, torque the large fittings to 18-25 ft. lbs. (25-34 Nm) and the small fittings to 7-14 ft. lbs. (10-20 Nm).
  5. After the system has been serviced: evacuate, recharge and leak test the air conditioning system as outlined in General Information & Maintenance .