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amsoildealer's avatar
amsoildealer
Explorer
May 26, 2015

A/C OVERLOAD RELAY KLIXON MRA-4759-117 HARD TO FIND

I have a 2003 Fleetwood 31ft with slide that has the single A/c unit. My A/c unit always works great but last year at the end of the summer it started when the a/c would start to come on it would cycle several times before compressor would kick in & come on but when a/c compressor comes on it is cold and compressor is quite. Now that I need my a/c again it keeps doing same thing it cycles several times trying to come on before the A/c will kick on and when it comes on it gets cold and a/c is quite and sounds good. I got up on the roof and had someone inside my camper to turn on a/c and I could hear it cycle and sounded like a relay clicking and after it cycled about 8 times a/c came on and sounded great and cooled great. I removed the cover I could hear a relay clicking and found the only relay I could remove was the overload relay manufacture Klixon part # MRA-4759-117. I thought I could go to my local rv store and pick one up but no one has them so I then stopped at all a/c shops and they do not offer it either. I went on ebay and can not find it there and when looking on the internet I found a coleman brand part # 6759-3791 and no one has it in stock. My question is do these overload relays go bad and cause A/C compressor to cycle several times before it comes on ? and is there a alternative overload relay I can use. Any help would be greatly appreciated.

5 Replies

  • Thank you for the replies. I agree there is a great chance it is in my compressor but I thought I would just try the overload relay first to rule out that possibility. When you mention bad start cap I'm not sure where that is located and if I can get a little more information I can check that. Thank You so much for all your help
  • I'm thinking that you BETTER put an ammeter on your A/C compressor BEFORE just throwing a bunch of parts at it!

    Is it possible the overload cut out is going bad? Sure, but there is a better chance the COMPRESSOR has an internal problem which is causing an overload..

    Just because the compressor "sounds" OK once it is running does not necessarily mean that the compressor IS OK..