Hummer H1 Service Manual page 722

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A/C System Leak Testing
There are two methods of detecting refrigerant leaks. One
method is with the use of an electronic leak detector and the
other uses a flourescent tracer dye in the refridgerant which is
viewed at the leak site with an ultra violet (black) light.
Dye leak testing
R134a florescent dye will remain in the lubricant for the life of
the vehicle as long as the vehicle's AC system has not been
flushed. To perform a dye leak test, do the following:
1. Recover the existing R134a refridgerant and record the
refridgerant weight.
2. Add R134a florescent dye J–41447 using the dye injector
J–41459.
3. Recharge the AC system following the procedures
outlined in chapter 11.
4. Check for leaks using the high intensity black light
J-42220. If no leaks can be found, advise the customer of
the dye in the system and that it may need to be checked at
a later date.
Figure 11-1: Dye Injector Use
05745159
Heating/Ventilation/Air Conditioning (HVAC)
Electronic leak testing
Recommended electronic leak detector is the D-Tek, pocket
portable model (Figure 11-2). It is self powered by NiCad bat-
teries, extremely compact, and will locate leaks as small as 1/4
ounce. The Kent-Moore Tool number is J–41995.
The D-Tek probe is flexible and can be used to make a 360
check of each hose connector and fitting. The correct method
of leak testing fittings is shown in Figure 11-2.1.
DYE
INJECTOR
00-S11-008
A/C system potential leak points are outlined in Figure 1-3. Be
sure to check each fitting and connector carefully with the D-
Tek tool.
Figure 11-2: D-Tek Leak Detector
Figure 11-2.1 Leak Testing Technique at
Connections
11-3
o
4-1-00