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.

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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 650 (CLIMATE CONTROL SYSTEM-GENERAL INFORMATION AND DIAGNOSTICS)GENERAL PROCEDURESFLUORESCENT DYE LEAK DETECTIONFLUORESCENT DYE DETECTION

2009 Mercury Milan Premier, 3.0 1, AWD

Fluorescent Dye Detection

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Fluorescent Dye Detection

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Ford Motor Company vehicles are produced with R-134a fluorescent dye installed in the refrigerant system from the factory. The location of leaks can be pinpointed by the bright yellow-green glow of the fluorescent dye under a UV lamp. Since more than one leak can exist, make sure to inspect each component, line and fitting in the refrigerant system for a leak.

Check for leaks using a Rotunda-approved UV lamp.
- Inspect all components, lines and fittings of the refrigerant system.
  
  Fig 1: Checking For Leaks Using Rotunda-Approved UV Lamp
  Courtesy of FORD MOTOR CO.
If a leak is found, recover the refrigerant. For additional information, refer to AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING .
Repair the refrigerant system leak(s).
Evacuate and charge the refrigerant system. For additional information, refer to AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING .
After the leak(s) is/are repaired, remove any traces of fluorescent dye with a general purpose oil solvent.
Verify the repair by running the vehicle for a short period of time and rechecking the area of the leak with a Rotunda-approved UV lamp.

Fig 2: Checking For Leaks Using Rotunda-Approved UV Lamp
Courtesy of FORD MOTOR CO.

RENDER: 1.0x

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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.