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Old 08-08-2019, 12:10 PM   #1
Junior Member
 
Brand: Thor Motor Coach
State: Michigan
Posts: 8
THOR #15286
The Siesta end gap is a giant air scoop

The 8Ē wide piece of trim that covers the gap between the rear wall and ceiling of my Sprinter 24SS became detached several times. While attempting to secure it again, I discovered the adjacent wall and ceiling to be soiled with a film of black road grime. A peek under the rear of the unit confirmed my suspicion that the bottom of the fiberglass rear cap was acting as a wind scoop. When driving at highway speeds, the area within the cap becomes pressurized, causing the trim panel to blow loose. My fix was to stuff the capís entire upper cavity with household fiberglass insulation and reinstall the trim panel with #6 screws. (I donít own a pneumatic pin nailer.) I havenít driven her yet but am confident I have resolved this annoying issue.
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Old 08-08-2019, 12:51 PM   #2
Senior Member
 
Brand: Thor Motor Coach
Model: Siesta 24SS
State: California
Posts: 168
THOR #12698
What year and model Siesta do you have? I have a 2018 Siesta 24SS and have not noticed that issue but I will be taking a closer look at mine to see if I have the same issue.
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Old 08-08-2019, 07:27 PM   #3
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Brand: Thor Motor Coach
State: Michigan
Posts: 8
THOR #15286
It's a 2018, just like yours.
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