Question about Coleman Mach III Air Conditioner

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Do you come across many leaks in the evaps of these units. I cant seem to find my leak of R-22 the unit is a coleman mach 3 rv unit.

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  • j92jimmy Jul 03, 2009

    I put a tap valve on the coleman mach 3 and when I put my gages on there was no gas in the unit.I scrapped the tap valve and installed 2 solder in shraders into the low and high side. after this, I pressure tested and ran my leak detector on everything I could without running it over the evaporator because it is encased in metal, I just figured it was an evap leak, because I lost my whole charge again. The evap is the only thing I didnt really leak check. thanks for any input. ps is the evap easy to access?

  • Jeff Myers May 11, 2010

    Why do you assume that the unit is leaking? What are the symptoms? It is very rare that a coleman mach III leaks out any freon.

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Yes, the evap is easy to access. On the upper unit, remove the metal cover that is on the front. There are screws down both sides and across the top and bottom. Once this is removed, the evaporator is right there. When you pressure tested the unit, did you lose pressure? If you have schrader valves soldered on the unit, then you should be able to run a vacuum on the system or pressurize it with nitorogen and see if you actually have a leak. Let me know what you find out.

Posted on Jul 03, 2009

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These units do not hold much gas. Look for oily spot on coils. Once it is gased up. Use some dishwashing liquid to find your leak. Rus

Posted on Jul 02, 2009

  • James Stopp
    James Stopp Jul 04, 2009

    The evap access is not to bad. Sounds like you know what your doing. Good luck Rus

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