IMPROVING YOUR ROOF A/C AIRFLOW
A few weeks ago, I noticed that the air flow from the air conditioners would
diminish with use, and the coil seemed to be "icing"....there were several
helpful suggestions, but none of which seemed to help my situation.
Yesterday, I removed the filter and inside cover and found the cooling coil
completely plugged with dust and other debris.
The "fix" is to remove the ductwork attached under the cooling coil, and
carefully clean the inside coil with a small hairbrush.   A vaccuum helps,
the brush will get between the fins and work out the debris.   The fins are
fragile, so use care in removing the debris.   None of this work is done on
the roof, as all the components are inside the coach.   The ductwork is held
be 4 screws, and the outside "rim" of the cold air return must first be
removed to access the ductwork.   There is some exposed wiring, so make sure
there is no power to the a/c unit.   This should be a maintence event every
couple years as it results in much more efficient cooling.
Here are some pictures.   Click on an image for a larger view.