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NHIrish's avatar
NHIrish
Explorer
Jul 25, 2013

Blower fan noise in Coleman Mach 49000 series A/C

After reading the posts about silver tape and blower noise on the Coleman Mach a/c rooftop units, I thought I knew what I would find when I opened up the unit to diagnose and repair blower rubbing noise....which I would describe as a rubbing noise on spin up/down.

Well, the foam and tape that was my concern all looked fine and there was no evidence of rubbing or chafing. The fan assembly is quiet when spun by hand (when fan assembly raised to inspect unit)....but when the unit is reassembled it is back to the rubbing noise that can be heard on spin up/down.

Don't know if it is serious or not, but it sure is irritating.

Any suggestions on this? Could it be a lubrication issue and if so are these units capable of being lubricated in the field?

4 Replies

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  • NHIrish's avatar
    NHIrish
    Explorer
    Jul 26, 2013
    MEXICOWANDERER wrote:
    "Hope this helps someone else."

    Me for one. Have a neighbor with the same unit (I think) and the same noise complaint. She will thank you. I'll get stuck with the repair :)


    Ha! Make sure you have a right angle screwdriver! Plan a 20 minute fix.
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Jul 25, 2013
    "Hope this helps someone else."

    Me for one. Have a neighbor with the same unit (I think) and the same noise complaint. She will thank you. I'll get stuck with the repair :)
  • NHIrish's avatar
    NHIrish
    Explorer
    Jul 25, 2013
    Well....fixed. I talked to tech support. First thing they advised was to remove the oft offending foam...."you don't need it". Second check the blower fan on the shaft as they slip. Did both and problem solved.
    Upon reexamining things, there was one spot where the foam had started to pull away from the side and was the likely cause of the rubbing sound....but wasn't particularly obvious as a problem first time through.
    Hope this helps someone else.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Jul 25, 2013
    Remove ceiling grill....you can then see squirrel cage of fan.
    Turn fan on and inspect fan operation.

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