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Tractor Talk Discussion Forum

Ford 5610 A/C problems

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George

05-02-2004 07:09:34




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I have a 5610 Ford tractor that has been converted from R12 over the R134A and the A/C is not working. Does anyone have any ideas on what to check for. Whoever made the change left the thermostat in place and connected along with the pressure switch. I believe the thermostat needs to be by-passed. Also I have read allot about how R134A in older systems my not cool properly. What about FR12?




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Bob

05-02-2004 08:11:38




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 Re: Ford 5610 A/C problems in reply to George, 05-02-2004 07:09:34  
You need to get a set of gauges on it and get some pressure readings.

If there is still an adequate amount of R-134 in it, the most likely culprit is a clogged expansion valve, probably with debris from a failed dryer.

Of course, compressor failure is possibility, too.

What thermostat do you think needs to be bypassed? Is it the operating thermostat with the capillary tube stuck in the evaporator, or do you have a high-temp cutout thermostat near the condensor? In either case, I'm not understanding why you'd want to bypass it.

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George

05-02-2004 17:31:41




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 Re: Re: Ford 5610 A/C problems in reply to Bob, 05-02-2004 08:11:38  
I have a thermostat that has the capillary tube stuck in the evaporator but I also have a clutch cycling pressure switch in series with controlling the on/off of the compressor. I was thinking that I may have a clogged expansion valve and or a pressure switch that is not setup for 134A. There is some difference in the cutout pressure between R12 and R134A. Also after doing some research I found that the expansion valve is either internally or externally adjustable which may not be set correctly. How is the best way to check for a leak? Dye or electronic leak detector? It's hard to find anyone locally that is good with A/C units that we have found at least in NE Texas.

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Jon H

05-02-2004 08:46:28




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 Re: Re: Ford 5610 A/C problems in reply to Bob, 05-02-2004 08:11:38  
When my Steiger KM325 AC was converted to 134a, a evaporator thermostat was ADDED to the system to cycle the compressor and reduce the heat load on the AC. The original system used no evaporator thermostat so the AC ran continuously at 100% load,and blended hot/cold air to get the desired cab temp. With the evaporator thermostat installed,the air blend door is set on cold air only and the AC is cycled to obtain the desired temp. This puts much less load on the AC system with it's less efficient 134a refrigerant.

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