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Old 05-06-2009, 10:01 PM   #1
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2005 30' Land Yacht 30 SL
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heat temp control 2005 LY 30 SO

I have a 2005 LY gas MH, 30 ft w/ slide and have noticed that the temp control knob on the dash does not really adjust the temperature up or down, but only turns the flow of radiator fluid to the heater core either on or off. There is no in between. Once the knob is turned up past a certain point, the temperature of the air that comes out into the cabin is just plain hot. I called AS and they said "yep, that's the way they made it." I'm not very happy with that , but, does anyone know of a way to modify this system so that the heat temperature is truly adjustable?
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Old 05-17-2009, 08:54 AM   #2
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Originally Posted by padillab View Post
I have a 2005 LY gas MH, 30 ft w/ slide and have noticed that the temp control knob on the dash does not really adjust the temperature up or down, but only turns the flow of radiator fluid to the heater core either on or off. There is no in between. Once the knob is turned up past a certain point, the temperature of the air that comes out into the cabin is just plain hot. I called AS and they said "yep, that's the way they made it." I'm not very happy with that , but, does anyone know of a way to modify this system so that the heat temperature is truly adjustable?
If I remember correctly my old cars had a lever that was connected to a cable similar to a bicycle brake cable, at the end it pushed or pulled a valve allowing the water to flow into the heater radiator, retrofitting a valve might not be too hard but I haven't found the dash heater in my 2000, I did find the house one by the steps and mostly inaccessable. Where did you find your heater core?
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Old 05-18-2009, 04:49 PM   #3
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Originally Posted by padillab View Post
I have a 2005 LY gas MH, 30 ft w/ slide and have noticed that the temp control knob on the dash does not really adjust the temperature up or down, but only turns the flow of radiator fluid to the heater core either on or off. There is no in between. Once the knob is turned up past a certain point, the temperature of the air that comes out into the cabin is just plain hot. I called AS and they said "yep, that's the way they made it." I'm not very happy with that , but, does anyone know of a way to modify this system so that the heat temperature is truly adjustable?
P-30 Dash Air Conditioner and "H" valve

While reading the archives I came across this post:

Any body with a P-30 chassis having problems getting the dash Air Conditioner to cool way down?

I noticed that my AC would be very cold at engine startup (about 58 degrees). But when the engine got up to temp (around 210 degrees) the air coming from the dash air was getting warmer, (about 70-80 degrees).

So the first thing I checked was the refrigerant pressures and they were perfect.

Then I checked vacuum lines to the heater control valve.
My system controls warm air with an in line water control valve that is vacuum operated. There is a second valve inside of the heater box that is mechanically operated with bowden wire and linkage. Both valves were working properly.

I got out my P-30 manual and it speaks specifically to a known problem with this setup.

The valve is not very proficient and allows hot water to enter the heater core on a constant basis. The heater core is placed directly adjacent to the AC evaporator.

Since the two devices are in very close proximity, the hot water that is in the core is raising the temperature in the evaporator and consequently effecting the temp of the refrigerant.

The corrective action is purchase an "H" valve from ACME heating and Air onditioning Inc. This valve is placed in line with the supply and return hoses the heater core. The valve is also bridged between the supply and return hose. This valve allows you to block all water from entering the heater core and re-route the water through the rest of the system.
This valve also allows you to better adjust the temperature to the heater. Cost is about 40 dollars.
You can search ACME Heatinig and Air Conditoner and read about the H valve.
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Old 05-19-2009, 09:02 AM   #4
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Evidently there are two types of temp. control systems for heating. My 2005 has an electronically controlled valve made by Evans that works through dash mounted potentiometer. Had to replace the valve once allready. Had the exact same symptoms as you, heat along with AC. Also could not control cab heat, all or nothing.
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Old 06-15-2009, 06:15 PM   #5
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Evidently there are two types of temp. control systems for heating. My 2005 has an electronically controlled valve made by Evans that works through dash mounted potentiometer. Had to replace the valve once allready. Had the exact same symptoms as you, heat along with AC. Also could not control cab heat, all or nothing.
Now that I have the same problem, I checked my system and it is acme with the H valve controlled by 3 wires from the dash switch. Found squirrel teeth marks on wires close the the heater. will have to figure out if it is a wire, motor or switch problem before we can use, temp coming out of vent with a/c on full was 120 degrees after 10 minutes of warmup.
Probably easiest to take the valve out and see if I can get it to move. With air temp at 90 sure don't need to add anymore heat to drivers area.
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