Basement heating
I have a Challenger 37GT and had some of the same heating issues in the forward cabin as others have mentioned. Opened the front register and found foil and sawdust blocking the channel. Cleaned it out and still didn't have much in the way of airflow with the heater on. Went back to the heater compartment and opened the grill and discovered 4 heater vent discharge lines. The one closest to the grill goes to the front. Pulled the metal flange end out of the floor and discovered that the circular metal part that extended into the chase was too long and essentially blocked any air flow to the front. Took tin snips and cut 1 inch off and now airflow to the front has dramatically increased from before. There is also a similar flange going to the basement. Same issue which limited any hot air getting into the basement. Snipped that one off and temps went up in the basement.
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