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200 Air Conditioner Valves
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dnel45 View Drop Down
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Joined: 13 Oct 2009
Location: Northwest Ohio
Points: 164 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dnel45 Quote  Post ReplyReply Direct Link To This Post Topic: 200 Air Conditioner Valves
    Posted: 30 Mar 2012 at 9:27am
A week or so ago there was a thread about putting in a valve on the hot water line that runs to the cab for use during summer air conditioning time.  I was looking at our 200 and there are two lines that run to the cab that get warm during operation, one on the right side of the engine from the water pump and one on the left side of the engine from the thermostat/temp sensor.  Do you have to put valves on both sides of the tractor to keep the warm water out of the heater? 
 
Background: We just redid the A/C with new 134a compressor, lines, etc., and it isn't as cold as it should be, especially after the tractor is warm.  The heater lines running into the cab are warm-hot during operatrion and I believe are killing what my A/C is trying to do.   
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Hurst View Drop Down
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Joined: 11 Sep 2009
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Points: 1218 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2012 at 11:46am
Nope, I put mine on the water pressure side.  It's a loop, so if you cut off flow to one side, you cut off flow completely.  Water pump side was the easiest for me to put a valve on and gave me a way to shut off pressure to those hoses and the heater core, versus putting the valve on the return, where you still have pressure on the heater core and hoses.

Hurst
1979 Allis Chalmers 7000
5800 Hours
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JW in MO View Drop Down
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Joined: 16 Feb 2010
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Points: 2666 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JW in MO Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2012 at 11:54am
I'm not familiar with the specific system you are working on, however, your heater should have a control that closes a valve in the water line.  Only one valve should be necessary but if both lines are HOT it is a possibility that the valve that SHOULD be in there is leaking by and adding heat.  If you can locate that valve and give it the touch test you will know.  I would think that the temprature control on your heater would regulate how far open or closed the valve is depending on the comfort setting.  If you are lucky that control will be manual with a cable and easy to find and work on.
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MACK View Drop Down
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Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2012 at 9:48pm
Put a ball valve in the top hose from motor. Most of the cab shutoff valves are junk. Might work to control heat in winter but shut the ball valve off in summer.   MACK
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Dave H View Drop Down
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Points: 3583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave H Quote  Post ReplyReply Direct Link To This Post Posted: 31 Mar 2012 at 7:22am
Originally posted by MACK MACK wrote:

Put a ball valve in the top hose from motor. Most of the cab shutoff valves are junk. Might work to control heat in winter but shut the ball valve off in summer.   MACK
 
Yep that even works on my old teen age powerstroke.  Wink
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