I would take it to International. I had a similar problem with my Kodiak chassis coach and it was the air blending unit which GM replaced under warranty. My International works well.
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2008 SuperNova (6331)
2011 Jeep Wrangler (Toad)
Now: 2011 Winnebago Journey Express
2011 Silverado 4x4 Texas Edition Extended Cab (Toad)
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