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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 113 (HVAC SYSTEM - GENERAL SERVICING)LEAK TESTINGELECTRONIC LEAK TESTING PROCEDURE
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F

Electronic Leak Testing Procedure

1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Electronic Leak Testing Procedure
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 1998 Pontiac Trans Sport, 1998 Oldsmobile Silhouette, 1998 Oldsmobile Bravada, 1998 GMC Yukon, and 1998 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Some electronic leak detectors will function on only R-12 systems or on only R-134a systems, and some will function on both R-12 and R-134a systems. Familiarize yourself with the tester being used and know what type of system you are leak testing.

Electronic leak detectors should be used in well ventilated areas. Avoid using them around explosive gases. Always follow manufacturer's instructions for the specific tester being used. If none are available, proceed as follows:

1)  Turn all controls and detector sensitivity knob to OFF position or zero setting. Connect leak detector to an approved source of power. Turn switch ON, and allow unit to warm up for approximately 5 minutes.

2)  Check operation of tester by positioning probe in a reference source where refrigerant is known to be present in small amounts. Adjust controls and sensitivity knob until detector reacts properly. Move probe away from refrigerant source and the reaction should stop. If it continues, adjust the sensitivity knob to a lower setting.

3)  When tester reacts properly, leak test air conditioning system by moving probe UNDER all components, fittings and connections. Keep the probe moving. To check evaporator insert probe into drain tube opening or a heater duct. DO NOT allow probe to contact refrigerant or refrigerant oil. When leaks are found, repair them as necessary. Keep in mind that there may be more than one leak.

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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