Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Leak Testing: Notes
Tools Required
- J 39400-A Halogen Leak Detector
- J 41447 R-134A A/C Tracer Dye-Box of 24
- J 41459 R-134A A/C Tracer Dye Injector
- J 42220 Universal 12V Leak Detection Lamp
- J 43872 Fluorescent Dye Cleaner
Important: GM vehicles are now manufactured with fluorescent dye installed in the A/C system.
The preferred method of leak testing is the use of fluorescent dye. J 41447 is the only dye approved by General Motors. Follow the Fluorescent Dye Injection procedure for vehicles that do not already contain the fluorescent dye.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.