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Old 12-04-2015, 08:31 PM   #1
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Chassis dash AC thermostat

I have a sticking AC thermostat. The dash AC does not come on until I tap on the thermostat with the handle of a screwdriver. My diagnosis is that the thermostat is bad. I do not see how to change the sensor tube with out taking the whole evaporator case out. A local dealer says he will do it but the bill will be over $1000. There has to be an easier way to change the part without taking the evaporator out. I was thinking about cutting a hole in the case but then I am still not sure if I can install the sensing tube. Do any of you replace the part and how did you do it? I have placed this message on another forum but no replies. Thanks
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Old 12-06-2015, 12:02 AM   #2
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You talking about the thermostat to prevent the evaporater from freezing over? If you are just bypass it. When using the AC you notice the cool air flow from the vents reducing turn the control to vent to melt the frost off the fins. If the air flow is good the the AC system has the correct refrigerant charge you shouldn't have to do very often.
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Old 12-06-2015, 03:13 AM   #3
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What a great idea. Problem solved. Thanks
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Old 12-06-2015, 07:03 PM   #4
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Thanks for the replies. You gave me a new idea but jumping the tstat is the way I will go since I am the only one who ever drives the RV and I can easily tell when it is icing up if that will ever happy in an RV. I might also do this: I will buy a stat from anything and wrap the sensing tube tight around the suction line right where it goes into the evapator and wrap prestige tape around all of it. You guys saved me at least a $1000 bucks. Thanks again--my problem solved!!!
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Old 08-25-2018, 07:10 PM   #5
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How is it now?

Just checking in to see if the bypass works the way you want?

The reason I ask is that our AC thermostat seems to be the issue with the Dash AC unit. If I go unplug a wire from the thermostat usually the AC starts working again. Then after a while it goes OFF (no cool are) and will not come ON again until I stop and go mess with the wires again. PITA.

I guess I can short the two wires together and get AC???

thanks for reading the comment.

G.
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