Quote:
Originally Posted by commodor47
We had our A/C gasket replaced this summer. There was a slow leak which was attributed to thick foam compression gasket. According to the dealer, those gaskets can break down over time. Have not had any water infiltration since the repair - and we had an especially rainy summer.
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This is quite common. The AC unit is quite heavy and mounted high above the axle and is subject to some pretty severe jarring. The foam gasket helps to maintain a seal but gets a lot of hard service. If a sealer is used, it would break down even more quickly unless it was a very aggressive sealer (like 3M5200). If they used 3M5200 to caulk the AC unit, the unit would never be able to be removed without causing severe damage to the roof.
It wouldn't be very peasant if we had to replace the roof each time the AC had to be serviced......
