I found the the by-pass valve (thanks guys), and took a pic. The attached is what my valves looked like. So, am I right in saying they were left incorrectly by the dealer?
Thanks
Yes, you are correct. They are incorrectly positioned. The one on the white/red pipe should be crosswise (closed); the other two should be "inline" (open).
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL