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Well we all need to guess, My guess is blocked duct work. Snaking the ducts? how did you do that they are flex and will rip if pushed on by a finger. You need to go under and look at the duct run, many are blocked partly by poor install. If you have a covered under side that needs removed to see anything. Did you actually speak with the service manager and if so what did he say. When I phone a business during open hours, I talk to someone.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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