200 Air Conditioner Valves
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=48178
Printed Date: 27 Aug 2025 at 5:31pm
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Topic: 200 Air Conditioner Valves
Posted By: dnel45
Subject: 200 Air Conditioner Valves
Date Posted: 30 Mar 2012 at 9:27am
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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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Replies:
Posted By: Hurst
Date Posted: 30 Mar 2012 at 11:46am
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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 |
Posted By: JW in MO
Date Posted: 30 Mar 2012 at 11:54am
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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. ------------- Maximum use of available resources! |
Posted By: MACK
Date 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 |
Posted By: Dave H
Date Posted: 31 Mar 2012 at 7:22am
Yep that even works on my old teen age powerstroke.
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MACK wrote: