CHECKING FOR REFRIGERANT LEAKS
=NMHA0292
Preliminary Check
NMHA0292S04
I
Perform a visual inspection of all refrigeration parts, fittings,
hoses and components for signs of A/C lubricant leakage,
damage and corrosion. A/C lubricant leakage may indicate an
area of refrigerant leakage. Allow extra inspection time in these
areas when using either an electronic refrigerant leak detector
or fluorescent dye leak detector.
I
If dye is observed, confirm the leak with an electronic refriger-
ant leak detector. It is possible a prior leak was repaired and
not properly cleaned.
I
When searching for leaks, do not stop when one leak is found
but continue to check for additional leaks at all system compo-
nents and connections.
I
When searching for refrigerant leaks using an electronic leak
detector, move the probe along the suspected leak area at 25
to 50 mm (1 to 2 in) per second and no further than 1/4 inch
from the component.
NOTE:
Moving the electronic leak detector probe slower and closer to
the suspected leak area will improve the chances of finding a
leak.
SHA705EB
ELECTRONIC REFRIGERANT LEAK DETECTOR
NMHA0293
Precautions for Handling Leak Detector
NMHA0293S01
When performing a refrigerant leak check, use an A/C leak detec-
tor or equivalent. Ensure that the instrument is calibrated and set
properly per the operating instructions.
The leak detector is a delicate device. In order to use the leak
detector properly, read the operating instructions and perform any
specified maintenance.
I
Other gases in the work area or substances on the A/C
components, for example, anti-freeze, windshield washer
fluid, solvents and lubricants, may falsely trigger the leak
detector. Make sure the surfaces to be checked are clean.
Clean with a dry cloth or blow off with shop air.
I
Do not allow the sensor tip of the detector to contact with
any substance. This can also cause false readings and
may damage the detector.
SHA707EA
1.
Position probe approximately 5 mm (3/16 in) away from point
to be checked.
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SERVICE PROCEDURE
Refrigerant Lines (Cont’d)
HA-91