How to Install a Gasket on a Coleman Mini Mach Rooftop Air Conditoner

The Coleman Mini Mach rooftop air conditioner is designed to heat and cool your recreational vehicle. The unit sits on the roof on top of a gasket to seal the unit in place and to help prevent leaks. Fluctuations in weather, or old age, can cause the gasket to crack, which will allow water to leak into the vehicle. A new gasket should last a few years.

Wrench
Gasket
Assistant
Towel

Instructions

- 1
  Remove the cover from the interior side of the air conditioner. The cover is on the roof and looks like a vent. The cover is held on by clips that you slide back to unlock. Once the cover is off, you will see four bolts and a wire harness.
- 2
  Unbolt the four bolts that hold the unit down using a wrench.
- 3
  Unplug the wire harness. Push in the tab on the unit to unplug the wire harness.
- 4
  Go up to the roof and with an assistant, tilt the unit back, and then lift it off the gasket.
- 5
  Pull up the old gasket and wipe along the channel with a cloth to remove any buildup.
- 6
  Lay the new gasket down along the channel and push it down into place.
- 7
  Lay the unit back into place on top of the gasket.
- 8
  Go back inside of the RV and plug the wire harness back in.
- 9
  Insert the four bolts back into place and use the wrench to tighten them. The bolts should be tight but do not force them. The bolts need a little play so that the unit does not crack the gasket.

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