Owner's Manual

MTC-104
REFRIGERANT LINES
Revision: March 2005 2005 Altima
3. Move the leak detector probe along the component at approxi-
mately 25 to 50 mm (1 to 2 in)/sec.
CHECKING PROCEDURE
NOTE:
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 a 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/cm
2
, 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/cm
2
, 50 psi) pressure.
4. Conduct the leak test from the high side (compressor discharge to evaporator inlet) to the low side (evap-
orator drain hose to the compressor shaft seal). Refer to MTC-91, "
Components" . Clean the component
to be checked and move the leak detector probe completely around the connection/component.
Perform a leak check for the following areas:
● Compressor
● High and low-pressure hose fittings, relief valve and shaft seal.
● Liquid tank
● Refrigerant pressure sensor
● Service valves
NOTE:
● Check that all the service valve caps are secure on the service valves (to prevent leaks).
● After removing A/C manifold gauge set from service valves, wipe any residue from the valves to pre-
vent any false readings by the leak detector.
● Cooling unit (evaporator)
NOTE:
● 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 rec-
ommended procedure for actual wait time) before inserting the leak detector probe into the drain
hose.
● Keep the probe inserted for at least 10 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 front air control as follows;
a. A/C switch: ON
b. Mode: face
c. Intake position: Recirculation
SHA708EA