Question about 2005 Kia Optima

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A/c compressor will not come on

Turn on a/c on the dash, all lights work, fan works but compressor will not come on, all fuses checked all ok, relay ok, but single green wire running to compressor has no power..

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  • paco566 Jun 04, 2009

    I had to put one 12 oz can in and it worked fine the rest of the day, the next morning same problem, is my valve dumping the freon? and can it be replaced or compressor need replaced? And why would it keep dumping it? Thanks for your help..

  • paco566 Jun 04, 2009

    K. Thanks, i have access to the tool and will check this weekend, i also put some dye in to see where leak is..

  • paco566 Jun 06, 2009

    K. found the leak, it is the compressor, took it off and it is leaking from the O ring where the compressor comes apart. Going to get new O ring Monday and put back together, and tighten it correctly, it was tighter on one side than the other. probably the cause of the leak.



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A/C Compressors run on pressure. If your system is very low or not freon at all. the compressor will not run. Have your system checked for freon, have some put in and have it checked for possible leaks.

Posted on Jun 01, 2009

  • 1 more comment 
  • Eric Shephard Jun 04, 2009

    you could have a leak somewhere. There is a special tool that can detect a leak by smell. You''ll have to take it to a garage mechanic that has this tool. It could be leaking around valves or fittings that have o-rings that have dried out. The best thing to do is to have it checked. and refilled.

    Good luck and let me know how you do,

    Thank you

  • Eric Shephard Jun 04, 2009

    Perfect the dye will help as long as the leak is in a spot that you can see. Sometimes it may be the under the dash behind the glovebox area.

  • Eric Shephard Jun 08, 2009

    Great, you'll be back in the cool in no time.



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