How to Perform Car AC Leak detection Test?

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The procedure for AC leak detection test is as follows :-------

Leak Detection

Leaks can be found using several means. These include soapy water, internal dyes, and several types of special leak detectors.

Soapy water is made by mixing water and soap to a thick solution that can be applied with a small brush. If the leak is large enough, soap bubbles will appear.

Soap bubbles showing a leak in a hose. Courtesy of Best Educational Trainers, Inc.

An internal charge detection method includes injecting a coloring agent into the low side of the system. Some red dyes are available in pound-size refrigerant containers. The dye is harmless and will be left in the system after the test. If dye leaks out, it will be visible at the source of the leak. A problem with the red dyes is that they can leak onto interior carpet and cause a damaging stain. If there is a leak, the dyed refrigerant will have to be recovered for reuse.

Another dye method uses fluorescent dye. A black light is used to locate the leak.

A fluorescent dye is added to the system before checking for leaks with a black light. Courtesy of Tracer Products, Westbury, NY.

This method is very effective on difficult leaks that only happen during the vibration that results from driving the vehicle. The dye will pinpoint where it leaked. The system is charged to at least 10% capacity for either test. This is so the system can develop normal operating pressure. There should be at least 50 psi static pressure (when the engine is off).

Electronic leak detectors are the most popular ones used today. Many of them work on both R-12 and R-134A refrigerants.

An electronic leak detector that works on both R-12 and R-134A refrigerants.

The tester nozzle is moved around the various joints in the system. The probe is held at a distance within 1/4" of the joint being checked. When a leak is found, the tester lights up and its slowly pulsing, high-pitched horn or clicking sound becomes more rapid. The tester has a sensitivity adjustment. You can adjust it so that it just stops ticking. When it starts to tick you have found a leak. The "gross leak" position can find leaks of 4 ounces per year. The sensitivity in this position is less so you can locate the exact source of the leak.

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This details will help.

Thanks.

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For car AC related and Heater related solutions. You can refer the options mentioned below:---

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http://technoanswers.blogspot.com/2011/10/car-ac-blows-warm-air.html

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http://technoanswers.blogspot.com/2011/10/auto-ac-cooling-problem.html

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http://howtobyme.blogspot.com/2011/10/how-to-fix-refrigerant-leak.html

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http://technoanswers.blogspot.com/2011/10/how-to-locate-car-ac-refrigerant-leak.html

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http://technoanswers.blogspot.com/2011/10/car-ac-intermittent-cooling.html

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