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05-01-2013, 01:33 PM
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#1
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Junior Member
Join Date: Jul 2012
Posts: 3
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1995 airex rexhall class A motorhome
Please help,
does anyone have pictures or a manual on how the heater hoses run from the 460 ford motor to the manual control valve then to the heater core and back to the motor? I think the machanic who put this motor in had no clue what he was doing. Any help would be appreciated.
thanks
rv warriors 
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05-02-2013, 12:25 AM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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Most gas engine run the same set up . Hot coolant from the intake manifold by the t'stat, to the water valve then into the core and back to the water pump.
Dodge used to make it easy for every one by using 1/2" on one side 5/8" on the other.
Are you having trouble getting heat ?
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-03-2013, 07:11 AM
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#3
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Junior Member
Join Date: Jul 2012
Posts: 3
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Airex motorhome
Thanks for the reply,
no, that's the problem - i'm getting heat all the time even when i turn on the air conditioner. And the valve seems to be working so i thought it might be hosed wrong.
Rv warriors
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05-03-2013, 10:10 AM
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#4
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,784
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Sounds like the hot water control valve was left out or bad. Could also be the vacuum lines were not connect correctly.
Chuck
__________________
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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05-03-2013, 10:17 AM
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#5
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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The manual valve , should shut off coolant flow through the heater, but the heater core may take a couple of mins to cool, and allow proper A/C function. Do you know if the A/C compressor is cycling; could be the electrical isn't hooked up , or that the system wasn't properly re-charged.
If the A/C is cycling , and you still have hot coolant in the core, you have to remove the water valve and check that the internal shut off is not rotted out, allowing coolant through.
Note: The cable adjustment of the water valve may be off, remove the cable and make sure your getting full travel of the lever, for flow shut off.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-04-2013, 02:58 PM
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#6
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Senior Member
Join Date: Oct 2009
Posts: 248
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I have EXACTLY the same problem! (1995 Newmar Kountry Star)
My AC works fine for about 15 minutes and then I get full blast heat from the heater.
I disconnected the bowden cable and it made no difference and I tried a brand new heater control valve.
I resorted to taking a trip to Home Depot and getting 2 3/4" PEX ball valves and hose clamps and cut the hoses and inserted the valves into both the input and output hoses. 3/4 PEX is perfect for the 5/8 hose.
I now know I have completely isolated the heater matrix from getting any hot water from the engine!
In the winter I can just open up the valves to allow normal heater operation
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05-04-2013, 09:47 PM
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#7
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Junior Member
Join Date: Jul 2012
Posts: 3
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Thanks Everyone,
I have new air conditioning system, so I know that's all good.
I will start with the control valve and go from there.
Thaks again,
road warriors
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