As I write this tip it’s hot… 96 degrees… here in Gila Bend, Arizona. You can bet we’re running the air conditioner.
An RV roof air conditioner sits on a large foam gasket and is held in place by four bolts or threaded rods and nuts that go through the A/C vent to the inside ceiling frame. This mounting method isolates much of the A/C vibration making it quieter running.
Over time the gasket will compress and the fastening bolts/nuts will become loose.
When this happens water leaks, either from rain or condensation from the operating air conditioner, can occur at the gasket. Fortunately the leak can usually be stopped by simply tightening the nuts/bolts. Don’t tighten them too much, just snug them, you still want the gasket to have some give.
If you can’t stop the leak by tighten the bolts, the gasket may be damaged or just too old, so you will want to replace it.
Replacing an A/C gasket can be strenuous… a roof A/C unit is pretty heavy… but it’s an easy project. Simply remove the fastening nuts/bolts, disconnect the wiring harness, go up on the roof and lift/tilt the air conditioner off the vent… it’s easier when two people do it. And you should have someone down below to make sure wires and such don’t get hung up.
New gaskets don’t need added putty and stuff, but you do need to make sure the roof edges around the vent are clean and don’t have gouges or dents through which water can leak.
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