Question about Coleman Mach III Air Conditioner

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Had "So Called" RV repairman work on Coleman 13.5 Roof AC! He said he fxed it first by lubrication then he replaced the "Hardsart" and told me if the fand stopped again to spin it to get it started and said I should just replace the AC. Another Mechanic PooPooed that Idea and ended up removing the "Hardstart" and wiring direct from the Diod! The sytem worked perfectly for a couple of days then the fan shut down again! Leter on I tried it again and after a "Clank" she started again and we turned it on during the day then off at night it would start the next morning and work fine! It os the fan because when it shuts down it just humms. It will not work now just humms!

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  • cliffclaus Aug 07, 2010

    I had gone the the question and answer forum and printed several solutions for problems very simular to mine and there was some close to your though not as specific! The city I am located has no RV AC expertise so I guess I will just play it by ear! I am glad I will not have to buy a new Air Coditioner!

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  • Coleman Master
  • 6,674 Answers

If the fan is not turning, but just humming, you need to replace the capacitor. If you were to spin the fan by hand (carefully) when it's doing this, it will speed up and run, until next time. The "hardstart" they refer to is for the compressor and it's basically the same idea, only it's added to the compressor start capacitor to assist it. If when the fan does run, your getting cool air, then the compressor start capacitor is probably ok, for now. The capacitors store extra voltage, for start up of fan, as well as compressor. Capacitors are approx $20, and take about 1/2 to change.

Posted on Aug 06, 2010

  • Mike Butler
    Mike Butler Aug 06, 2010

    One thing I forgot to tell you is that capacitors can give a real good "Jolt", (shock) if not handled properly, as they store anywhere from 250-370 volts usually in that application, whether power is turned off or not, so someone experienced should be doing the replacement.

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