Dometic? The newly introduced model (not the penguin or BriskII), believe blizzard? Has a design fault with the outside cover which can allow outside water to seep in. Make sure your dealer checks for that. Failing that, the gasket between the AC and the roof would be a likely source. If it was installed incorrectly and pinched/deformed in the process, tightening may not work and a new seal/ gasket may be required.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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