Dash Vent/Heat/Air

[fulltiming]

Today, Tom and I spent the afternoon tracking down a problem I have had for the 3 years I have owned my coach, i.e. virtually no air comes out of the dash vents or defrosters.

We determined that the air flow was not significantly improved by opening up the rear of the blower chamber (eliminating the air intake as being the cause), that the air flow coming out of the top of the air plenum was indeed pitiful (eliminating the ducts as being the cause), and that the amperage draw was appropriate. That left excessive voltage drop as a potential cause. We hookup up a battery charger to the power supply line and got no improvement at 13+ volts. We then tried reversing the direction of rotation by swapping the positive and negative leads on the motors. That did it. All three blower motors had been wired (or rewired at some point) incorrectly and the squirrel cage blowers were turning the wrong direction.

After rewiring all three motors, I now have significantly better air flow than anytime I have had the coach. The airflow is equal to or great than Tom's Newell.

Thanks for the help Tom!!