Skip to main content ↑ ↓
Topic: Dash A/C booster fans (Read 745 times) previous topic - next topic

Dash A/C booster fans

I have appreciated the discussion in the thread "Dash A/C Question".  Some the recent replies got me thinking about ways to increase air flow in the ducts.  It seemed good to start a new thread.

It seems one of the big problems with the dash A/C in the late 1990 model U series coach is low volume of airflow out of the vents on the passenger side.

I was wondering if installing muffin fans as booster fans inline on the ducts would help.  Some home HVAC systems have booster fans to help move the air.

I was wondering if it would be possible to use a 12 volt computer muffin fan sandwiched between something like  a properly sized Valterra sewer flange (the part the goes on the back side of a Bladex gate valve) to create a booster fan that is installed inline on the dash ducting.

Our coach is in for service right now so I can't check the size of the duct.

Wondering if anybody has any thoughts about increasing airflow with this method.

Thanks,
Chris

Re: Dash A/C booster fans

Reply #1 –
I'm all eyes on any way to help the dash air. Please
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Dash A/C booster fans

Reply #2 –
Bilge blowers move about 170cfm and are 3"/12v.
1998 36' U295 Mechanical 8.3

Re: Dash A/C booster fans

Reply #3 –
Quote from: Racedad –
Bilge blowers move about 170cfm and are 3"/12v.

I had not seen these before!  They are very affordable.

If the dash duct hose is also 3" then this is the type of setup I was thinking about.

Chris

Re: Dash A/C booster fans

Reply #5 –
I'm with Bob. Air flow especially for defrost is poor. Have been thinking of replacing some of the ducts due to kinking a bends. Just don't know what to use.
All eyes here too.
Dick
Dick, '03 U320 40' Tag, 2 slides, Coach #6075
Full Timers
2009 Honda CR-V

Re: Dash A/C booster fans

Reply #6 –
Quote from: Dick S –
I'm with Bob. Air flow especially for defrost is poor. Have been thinking of replacing some of the ducts due to kinking a bends. Just don't know what to use.
All eyes here too.
Dick
The AH works for an excellent defroster.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Dash A/C booster fans

Reply #7 –
When I replaced the dash air/heater blower motor ( a lot of work ) I cleaned the veins on the squirrel cage blower wheels. They were incrusted with hard dirt that had reduced the shape of the veins by quite a bit. The new motor and cleaned up blower wheels made a nothicable increase in airflow.
My blower chattered on start up and for the first few minutes of use so I had to change it. On my coach I was able to get the blower assembly out without breaking the freon lines. Foretravel quoted ten hours to change mine and that probably did not include cleaning the blower wheels.
John Duld
1995 U320C SE 40'

Re: Dash A/C booster fans

Reply #8 –
I thought about the dirt buidup on the wheels.  Hmmm 10 hours.....
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4