Appendix 21
Appendix
Electronic Probe-Type Detector Instructions (according to SAE 1627)
1. The electric leak detector shall be operated in accordance with the equipment manufacturer`s
operating instructions.
2. Leak test with the engine not in operation.
3. The air conditioning system shall be charged with sufficient refrigerant to have a gauge pressure of
at least 340 kPa when not in operation. At temperatures below 15°C, leaks may not be
measurable, since this pressure may not be reached.
4. Take care not to contaminate the detector probe tip if the part being tested is contaminated. If the
part is particulary dirty, it should be wiped off with a dry shop towel or blown off with shop air. No
cleaners or solvents shall be used, since many electronic detectors are sensitive to their
ingredients.
5. Visually trace the entire refrigerant system, and look for signs of air-conditioning lubricant leakage,
damage, and corrosion on all lines, hoses, and components. Each questionable area shall be
carefully checked with the detector probe, as well as all fittings, hose to line couplings, refrigerant
controls, service ports with caps in place, brazed or welded areas, and areas arround attachement
points and hold-downs on lines and components.
6. Always follow the refrigerant system around in a continuous path so that no areas of potential
leaks are missed. If a leak is found, always continue to test the reminder of the system.
7. At each area checked, the probe shall be moved around the location, at a rate no more than 25 to
50mm/s, and no more than 5mm from the surface completely around the position. Slower and
closer movement or the probe greatly improves the likelihood of finding a leak.
8. An apparent leak shall be verified at least once by blowing shop air into the area of the suspected
leak, if necessary, and repeating the check of the area. In cases of very large leaks, blowing out the
area with shop air often helps locate the exact position of the leak.
9. Leak testing ot the evaporator core while in the air conditioning module shall be accomplished by
turning the air conditioning blower on high for a period of 15s minimum, shutting it off, then
waiting for the refrigerant to accumulate in the case for time specified by 9.1, then inserting the
leak detector probe into the blower resistor block or condensate drain hole if no water is present,
or into the closest opening in the heating/ventilation/air conditioning case to the evaporator, such
as the heater duct or a vent duct. If the detector alarms, a leak apparently has been found.
9.1The accumulation time for evaporator testing is 10min.
10.Following any service to the refrigerant system of vehicle, and any other service which disturbs the
refrigerant system, a leak test of the repair and of the service ports of the refrigerant system shall
be done.
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