Ours quit heating and it was plugged up with lint. It was in the elbow before it got to the vent hose. Once I got that cleaned out it heated like it should.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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