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Fluorescent Dye Injection - Using a Dye Injector Loop Kit Ford Mustang V

HVAC Control System - General Information and Diagnostics 6 illustrations ~427 words

Fluorescent Dye Injection - Using a Dye Injector Loop Kit

Note. Fluorescent refrigerant system dye is added to the refrigerant system at the factory to assist in refrigerant system leak diagnosis using a Rotunda-approved ultraviolet blacklight. It is not necessary to add additional dye to the refrigerant system before diagnosing leaks, even if a significant amount of refrigerant has been removed from the system. Replacement suction accumulators and receiver/driers are shipped with a fluorescent dye "wafer" included in the desiccant bag which will dissolve after approximately 30 minutes of continued A/C operation. It is not necessary to add dye after flushing or filtering the refrigerant system because a new suction accumulator or receiver/drier is installed as part of the flushing or filtering procedure. Additional refrigerant system dye should only be added if more than 50% of the refrigerant system lubricant capacity has been lost due to a fitting separation, hose rupture or other damage.

Note. Before using the R-134a fluorescent dye injector for the first time, refer to the equipment manufacturer's instructions on evacuation of non-condensable gasses from the hoses.

Note. Refrigerant system pressure should be between 413-551 kPa (60-80 psi) at 24°C (75°F).

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Scheme 126: Fluorescent Dye Injection - Using a Dye Injector Loop Kit
Scheme 126: Fluorescent Dye Injection - Using a Dye Injector Loop Kit

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  1. Verify that the valves on the deluxe injector loop kit are closed. (Scheme 112): Identifying Valves On Fluorescent Dye Injector
  2. Fill the deluxe injector loop kit reservoir with 7 ml (0.25 oz) of fluorescent dye. (Scheme 113): Locating Dye Injector Reservoir
  3. Install the deluxe injector loop kit between the high-pressure and low-pressure service gauge port valves. CAUTION: Make sure all tools and hoses are clear of the engine cooling fan and drive belt before starting the engine.
  4. Start the engine.
  5. Open the high-pressure service valve. (Scheme 114): Identifying High-Pressure Service Valve
  6. Open the deluxe injector loop kit valves and inject the fluorescent dye into the refrigerant system. (Scheme 115): Identifying Valves On Deluxe Injector Loop Kit
  7. Close the high-pressure service valve to allow the pressure inside the deluxe injector loop kit to equalize with the suction side of the refrigerant system. (Scheme 116): Identifying High-Pressure Service Valve NOTE: Close the valves on the deluxe injector loop kit while the A/C compressor is operating.
  8. Close the valves on the deluxe injector loop kit. (Scheme 117): Identifying Valves On Deluxe Injector Loop Kit NOTE: Leave all valves on the special tool closed when not in use.
  9. Disconnect the high-pressure and low-pressure service valves and remove the deluxe injector loop kit from the vehicle.