Pathfinder SE 2WD V6-3.3L (VG33E) (1999)
3. Move probe along component approximately 25 to 50 mm (1 to 2 in)/sec.
CHECKING PROCEDURE
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette smoke in the vicinity of the vehicle.
Perform the leak test in calm area (low air/wind movement) so that the leaking refrigerant is not dispersed.
1. Turn engine off.
2. Connect a suitable A/C manifold gauge set to the A/C service ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/sq.cm, 50 psi) above 16° C (61° F). If less than specification,
recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE: At temperatures below 16° C (61° F), leaks may not be detected since the system may not reach 345 kPa (3.52 kg/sq.cm, 50 psi).
4. Conduct the leak test from the high side (compressor discharge a to evaporator inlet f) to the low side (evaporator drain hose g to shaft seal
I).Perform a leak check for the following areas carefully. Clean the component to be checked and move the leak detector probe completely
around the connection/component.
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Compressor
Check the fitting of high and low pressure hoses, relief valve and shaft seal.
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Liquid tank
Check the pressure switch, tube fitting, weld seams and the fusible plug mount.
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Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to prevent leaks).
NOTE: After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any false readings by leak
detector.
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Cooling unit (Evaporator)
With engine OFF, turn blower fan on "High" for at least 15 seconds to dissipate any refrigerant trace in the cooling unit. Wait a minimum of
10 minutes accumulation time (refer to the manufacturer's recommended procedure for actual wait time) before inserting the leak detector
probe into the drain hose. Keep the probe inserted for at least ten seconds. Use caution not to contaminate the probe tip with water or dirt that
may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected leak, then repeat check as outlined
above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.
7. Start engine.
8. Set the heater A/C control as follows:
1. A/C switch ON.
2. Face mode
3. Recirculation switch ON
4. Max cold temperature
5. Fan speed high
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4 through 6 above.