Question about Coleman Mach III Air Conditioner

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Compressor wont start

My bus has a rarely used older unit that ran perfectly until last week. I noticed that during the cycle to start the compressor, it slowed down for about 10 seconds, compressor does not start, then fan resumes normal speed for a couple of minutes. it then lugs down again (fan also) for the 10 seconds or thereabouts, thens resumes normal fan operation for a couple of minutes or so. Its like it cycles for the compressor and when it doesn't start, it waits a certain period then does it all again. I was working in the bus when it did it and noticed it immediately.It worked so normally I have a hard time thinking its the compressor.

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  • stproman Jun 23, 2008

    That makes sense. The unit ran perfectly until the evening it started cycling repeatedly. Its an older unit that was on an older bus conversion I am restoring, and had very little use, which can be bad. I tried it the next morning and it was exactly the same. I will pull the cover and check the compressor for grounding and go from there. If I have any further questions I will go for the premium assistance. I appreciate you. LS

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It is probably a failed run capacitor for the compressor. Without the capacitor, the motor can't even try to run, but it will draw extreamly high amperage until it trips the thermal overload (avarage trip time 5-10sec) after it has a few second for the safety to cool off, it will try again. Either that or the compressor truly is seized

Posted on Jun 23, 2008

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