I know tighten gasket bolts. Thats not the proublem,when it is running when raining leaks where cold air comes out. Dosent run water when dry outside and running.Is there a seal on the air intake or deverter for water? Is it sucking water from coil? Its a coleman mac 13500. My other ac did the same,cleaned filter and it stopped. Cleaned filters in 13500 didnt make a deference. thanks Mike
The drain pan for the roof A/C unit has drain holes that allow rain water to drain off the units pan, if clogged up, the pan can over flow into the RV.
If that isn't it...time for a new gasket for the A/C roof seal...it can be compressed only so much before it gives out.
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I had a similar issue with one of my coleman mac 13500s (Airxcel). Is yours nose down? Mine was nose down and would leak only when raining. During a rainstorm, I turned off the breaker and removed the lower cover. On the front side of the large opening, the side pointing down, you can put your fingers over the pan lip and see if water is damning up in the pan. Airxcel told me the manufacturer was supposed to drill out the 2 3/8" holes on the front of the pan in nose down situations. I had to drill them out and it fixed it. The spot for the 2 holes is already marked with indentations.
Just fyi, rooftop ACs do not have an external air intake. No fresh air is brought into the coach.
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We had a a shower skylight leak that would come through the rear A/C in a heavy rain. On a Monaco product they have a layer of foam in the roof sandwich that really allows water to migrate. I am sure this is by design so that the water can migrate and eventually dry as opposed to just sitting in or on the luan.