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Dye Solution Leak Testing Procedures

CAUTION: Dye-charged refrigerant cans are available to be used as internal leak detectors. Use of this type of solution may void some manufacturers warranties. Be sure to check with A/C system manufacturer concerning use of dye-charged leak detectors. Dyes which work in R-12 systems will not work in R-134a systems.

The following procedure is for introducing a dye solution, not dye-charged refrigerant, into A/C system.

  1. Connect manifold gauge set to A/C system in a normal manner. Remove center hose from manifold gauge set and replace it with a short piece (6" long) of 1/4" tubing using two 1/4" flare nuts. Connect a container of dye solution to tubing.
  2. Connect one end of gauge set center hose to dye solution container. Connect a container of refrigerant to other end of hose. Operate engine at idle. Set A/C system for maximum cooling. Slowly open low-side hand valve to allow dye solution to enter system.
  3. Charge system to at least 50 percent capacity. Operate system for 15 minutes and then shut off both A/C system and engine. Check all connections for signs of colored dye solution. Check vehicle again 24 hours later. If leaks are found, repair as necessary.
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