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11-29-2015, 12:14 AM
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#1
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Senior Member
Freightliner Owners Club
Join Date: May 2012
Location: Newport, WA
Posts: 372
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Counter-intuitive improved heater performance
About an hour and a half into our first long winter RV trip, I was thinking about the poor dash heat situation. It suddenly hit me that "Max A/C" would recirculate air through the system instead of bringing in frigid outside air, and that the heater might perform quite a lot better trying to heat 60f air instead of 20f.
Bingo! We now have excellent heater performance, and it still is governed by the temp control. I don't know if the a/c compressor automatically runs or if the compressor clutch is switched on and off by the temp control, but to be honest, I'm so happy about having warm feet that I don't care!
We will be in reliably warm weather soon and away from my workshop for quite awhile, but I'm thinking about what it would take to add a recirculate control. IIRC, the air control shutters are air powered (vacuum?). It should be possible to control recirc with a solenoid valve similar to the half-dozen under the hood of our cars. That would allow all of the vent positions, including defrost, to actually deliver reasonably hot air.
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'04 National TropiCal T350 Behind the coach:
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11-29-2015, 01:07 AM
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#2
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,090
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I run on "Max A/C" with the temperature set to high in the winter because it does turn on the air conditioning which removes the moisture from the air inside the coach and keeps my windshield from fogging up.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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11-29-2015, 10:41 AM
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#3
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Senior Member
Fleetwood Owners Club Freightliner Owners Club Spartan Chassis
Join Date: Nov 2009
Location: FORT WORTH, TEXAS
Posts: 2,744
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I have a recirculate button on my controls and it works great when you need more heat or AC.
Bill
__________________
2008 Newmar Mountain Aire
450 HP Cummins ISM 4000MH Allison Trans.
Towing a 2014 Honda CRV with a Blue Ox tow bar.
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11-29-2015, 03:19 PM
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#4
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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We use a clear plastic shower curtain my DW got at bed bath and beyond. I strung a strong wire near the ceiling and then screwed a small clip on the wire in the middle to the ceiling to minimize the gap. We Then used paper clips as hangers on the curtain to slide on the wire. One end is also secured to the side wall permanently. when pulled away from the wall the two sides stay together in the middle with magnetic strips.
we stow the curtain next to the wall behind the forward seats when not used. I made some custom holders to keep the curtain contained next to the walls when not use. Use some heavy gauge aluminum wire as clips. When we do use them is for cold or hot conditions when we really want comfort in the cockpit.
Also use them at night when it is really cold out to minimize the loss of the furnace air against all the front window glass. These curtain are available in various length and we use two of them to cover the front cockpit area.
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La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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12-01-2015, 06:47 AM
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#5
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Member
Winnebago Owners Club
Join Date: Mar 2011
Posts: 94
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I just turn the furnance on set to 60 deg and the dashboard heater works fine.
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12-01-2015, 08:23 AM
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#6
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,754
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The heat/AC controls in my coach are right out of the 60s, twist knobs and all. So I have to think about my old Malibu when operating them.
__________________
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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01-09-2016, 08:30 AM
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#7
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2010
Location: Texas
Posts: 4,283
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Thanks for this tip. Recently helped when out in the southwest where it's suppose to be warm but below freezing much.
__________________
Full Timers.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
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01-09-2016, 08:49 AM
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#8
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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Quote:
Originally Posted by Cat320
The heat/AC controls in my coach are right out of the 60s, twist knobs and all. So I have to think about my old Malibu when operating them.
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Same here. Two buttons ( A/C & Recirculate).
I always recirculate when heating, but still not enough heat.
Engine runs around 190 on the flat, but I think the 40ft hose run gives it time to cool down
before getying into the heater core.
AND I AM IN SO. CALIF
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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