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Car A/C Leak Detection and Repair


Narrator: Refrigerant leaks are the most common problem in an air conditioning system, and are usually the result of faulty hoses or rubber O-rings. Large leaks are rare and require the system to be opened up for repair. However, most system leaks are small. While they cannot be detected by the naked eye, small leaks are the leading cause of poor A/C performance. Fortunately, small leaks can be easily corrected using the Interdynamics R134a UV Leak Detector and Sealer Kit. The kit contains one can of direct charge leak detector dye, which is good for five applications, along with a can of direct charge leak sealer. Also included in the kit is a UV pen light and pair of UV fluorescent safety glasses, allowing even the smallest leaks to be quickly detected. Before using the kit, identify the low-side service port in the A/C system. Depending on the vehicle, the low-side port will be located on the accumulator or mounted on the large diameter line between the compressor and the evaporator. Remember to always wear safety glasses and a pair of mechanics’ gloves before working on the system. Now remove the service port cap and then start the engine and set the A/C controls to maximum cooling. Next, remove the cap from the can of leak detector dye and shake the can vigorously. While holding the can upside down, place the direct charge nozzle over the low-side port and hold for five seconds. This will allow one application of dye to be injected. Now replace the service port cap and allow the engine to run with the A/C on for at least ten minutes in a well ventilated area. This will give the dye adequate time to circulate. Driving the vehicle for at least five miles is another acceptable method for circulating the dye. Before checking for leaks, turn the engine off. Now, with your UV safety glasses on, shine the pen light around fittings, along metal lines and hoses, and the connections at the rear of the compressor. The presence of dye in any of these areas indicates that a leak exists. To seal the leak, add the leak sealer through the low-side service port with the engine running and the A/C controls set to maximum cooling. Continue to inject the sealer until the can is completely empty.

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