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Old 05-01-2013, 02:33 PM   #1
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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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Old 05-02-2013, 01:25 AM   #2
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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 ?
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Old 05-03-2013, 08:11 AM   #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.
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Old 05-03-2013, 11:10 AM   #4
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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
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Old 05-03-2013, 11:17 AM   #5
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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.
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Old 05-04-2013, 03:58 PM   #6
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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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Old 05-04-2013, 10:47 PM   #7
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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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