10-20-2022, 06:22 PM
Dear Fellow Newell Owners, We did change our dash air system from R-12 over to R-134A in our #277, 1991 coach. It cools OK, but the air flow is almost terrible! Worse, what little it has goes to about zero when we begin driving.
So far, I've determined that the aerodynamics of the front lips creates a low pressure area behind it, where the dash air box has big drain holes. I connected 2' PVC pipes with elbows to feed the drain holes and retained the little air flow while driving.
The best I can tell as I viewed the air box when Newell removed it because I ask them to verify the air box is unobstructed, is that Newell did a terrible design job with the top of the air box. The tree blower motors in there blow through restrictive holes into a rectangular channel with a sliding bar to select the modes and air vents. Poor for air flow. I intend to retain the three blowers, but only run one at a time to directly feed the different vents. Each vent will feed a 3" duct which y's to 2 1/2" tubes to feed the vents.
I hope to do this project in the next couple of months. I'll post as to results.
deg
So far, I've determined that the aerodynamics of the front lips creates a low pressure area behind it, where the dash air box has big drain holes. I connected 2' PVC pipes with elbows to feed the drain holes and retained the little air flow while driving.
The best I can tell as I viewed the air box when Newell removed it because I ask them to verify the air box is unobstructed, is that Newell did a terrible design job with the top of the air box. The tree blower motors in there blow through restrictive holes into a rectangular channel with a sliding bar to select the modes and air vents. Poor for air flow. I intend to retain the three blowers, but only run one at a time to directly feed the different vents. Each vent will feed a 3" duct which y's to 2 1/2" tubes to feed the vents.
I hope to do this project in the next couple of months. I'll post as to results.
deg