Question about 2006 Mitsubishi Galant

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Freon leaking and the dye test has been done 6 times. No sign of lesk.

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Leak will probably where you cannot see it..... in the evaporator core in the dash. An A/C shop with a freon sniffer can tell you and verify. I hope this wasn't the same shop 6 times.

Posted on Sep 09, 2010

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  • Larry Robins Sep 09, 2010

    same shop 6 times. Evap core and condensor and some valves were all replaced. Still leaks. Sealer put in the system for small leaks. Still leaks. Very frustrrated.

  • Dirt Dobber
    Dirt Dobber Sep 09, 2010

    Wow i bet your frustrated. You've probably got boo coo $$ spent at this shop. The same person will make the same error or miss the same thing over and over. That's why I had hoped it was at least 2 shops. The dye test is good only if you can see it with your eyes or under a specific kind of light used to highlight the dye. Possible out of the box ideas would be behind or at the Compressor mount area, abrasion areas where lines or hoses touch something, a hose that has internal separation and it will leak through to the surface in many minute areas or pin holes and wont appear as a leak in one spot. Have them use an inspection mirror and visually inspect all side of each line and hose and not skip any area.

  • Dirt Dobber
    Dirt Dobber Sep 09, 2010

    It the system actually losing freon or is there another issue causing it not to cool but is still charged with freon?



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Hi there:
What can happen is the vehicles Freon will leak out and reduce the total pressure in the system. Then the low-pressure cut out switch will disengage the compressor when the low side is detected below 25 psi.

This safety feature is to protect the compressor itself. I have seen mechanics bypass the low cut out switch for testing. This should never be done and is not recommended.

The visual presence of oil around a fitting or pressurized line is a strong indication of a refrigerant leak. So my first step in air-conditioning leak diagnosis is to perform a very careful visual inspection of the entire system.

Although this is always my first step for diagnosing Freon leaks it is not always effective in finding the exact problem. In fact, this visual inspection will only uncover large to extremely large leaks. A more common air-conditioning problem would be small leaks that allow Freon to escape over long periods of time. So to follow will be some methods to detect these small leaks.
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- To find refrigerant leaks using the fluorescent tracer system, you first have to install the fluorescent dye into the cars air-conditioning system. Always follow the instructions and do not install too much dye! Too much can reduce the cooling efficiency of the system. Different refrigerant dye leak detectors will accomplish this in different ways. The system we use at work has a device that looks like a caulking gun, and a hose that connects to the low side fitting. Then you actually push the dye into the low side with the engine running and the compressor engaged. Next you run the air-conditioning system for several minutes to distribute the dye evenly. Then you put on your yellow glasses and examine the system with a fluorescent light.
The fluorescent dye shows up easily wearing the yellow glasses.

A very popular selling item is Refrigerant with leak sealer. This item will only seal very small leaks. I have used the stuff pictured to the right "super seal pro" and it does work in some situations.

The Freon leak sealer works best when you have low side system leaks. And if you happen to have a small leak from an O-ring on the low side this stuff works well. If you have a leak on the high-pressure side chances are this sealer will not work for you.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

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