I just repaired one of those due to a failed cooling unit. From the outside, behind the access vent, there is a heating element that you can see high up on the right that sticks out of the chimney. There are 2 black wires leading to it. If you are able to move that element back and forth a little then it's likely OK. If you can't then it has overheated, welding itself to the chimney, and the element and cooling unit are shot and will need replacing.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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