Forum Discussion

Racorman's avatar
Racorman
Explorer
Nov 05, 2017

Coleman-Mach Mach 3 Plus air conditioner Question

I have a Coleman-Mach Mach 3 Plus air conditioner and I pulled off the interior ceiling cover to vacuum out the dust covered A/C fins. While doing it, I must have disconnected one of the wires labeled "FREEZE" as shown in the photos. Problem is I don't know where it is plugged into, or if I even need it to be plugged in. The A/C still works with this wire unplugged.

Does anyone have information or knowledge what this wire does or where it needs to be plugged into?

Thanks





Class A
  • azrving's avatar
    azrving
    Explorer
    Nov 05, 2017
    Sensor, leave it where it was. Use the RV.net picture link
  • ksg5000's avatar
    ksg5000
    Explorer
    Nov 05, 2017
    That appears to be a freeze sensor - believe it's suppose to be inserted into the center of evaporator coil between 2nd and 3rd line from bottom. Google should have online PDF for exact sensor position.
  • Racorman's avatar
    Racorman
    Explorer
    Nov 05, 2017
    ksg5000 wrote:
    That appears to be a freeze sensor - believe it's suppose to be inserted into the center of evaporator coil between 2nd and 3rd line from bottom. Google should have online PDF for exact sensor position.


    Thanks Kevin.... any chance you could locate that link?
  • Racorman's avatar
    Racorman
    Explorer
    Nov 05, 2017
    rjxj wrote:
    Sensor, leave it where it was. Use the RV.net picture link


    Problem is, I don't know where it was :h
  • azrving's avatar
    azrving
    Explorer
    Nov 05, 2017
    Racorman wrote:
    rjxj wrote:
    Sensor, leave it where it was. Use the RV.net picture link


    Problem is, I don't know where it was :h


    OH ok, Sorry, I thought your first pic showed it taped up. It goes at the edge of the coil to sense ice build up. Usually there will be a small area in the fins where they originally placed it. Look along the lower edge and there may be a gap in the fins. Be careful because the coil tubes are in there and carry the refrigerant.
  • Racorman's avatar
    Racorman
    Explorer
    Nov 05, 2017
    I think I found it at 4:17 in this video.....

    https://youtu.be/E9H4CufT7oU
  • Racorman's avatar
    Racorman
    Explorer
    Nov 05, 2017
    Thanks guys for the information. I tackled the problem from the roof and removed the cowl and sheet metal to access the fins where the temp sensor resided. Beside easy access I was able to vacuum all the debris from the fins which increased the efficiency of the A/C :C



  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Nov 05, 2017
    ksg5000 wrote:
    That appears to be a freeze sensor - believe it's suppose to be inserted into the center of evaporator coil between 2nd and 3rd line from bottom. Google should have online PDF for exact sensor position.


    No photos here since you use Photo dump..er. bucket and I don't

    But the freeze sensor just plugs in to the evaporator coils near the bottom.. Precise positioning is not really all that important.

About Motorhome Group

38,705 PostsLatest Activity: Jan 14, 2025