AC keeps ruining thermostats

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  #1  
Old 10-08-18, 11:21 AM
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AC keeps ruining thermostats

About a week ago I had to change out the module on my x13 blower motor because of a blown thermistor. Last Friday, I came home to find that my blower motor wasn't running again. I was able to troubleshoot it to a bad thermostat. I replaced that thermostat and everything was up and running again. Then Saturday am, the same thing happened again. I replaced the Thermostat and again all was well. This morning that thermostat was toast. If I jump the r and g terminals, then everything works fine except my blower fan is always running. I have no idea what to check next.
 
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Old 10-08-18, 11:28 AM
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Welcome to the forums.

Is the thermostat operating in cooling mode ?
You may have a short in the wiring going to the outside condenser.

Thermostats don't usually fail unless they try to switch on a shorted load.
 
  #3  
Old 10-08-18, 11:34 AM
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Yes, the thermostat is operating fine in cooling mode. It's only the fan circuit that keeps frying.
 
  #4  
Old 10-08-18, 12:16 PM
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Could that also be what fried the thermistor on my old motor module?
 
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Old 10-08-18, 12:20 PM
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The thermostat is only a switch,. It connects or disconnects a circuit. It can't blow anything out.
The thermistor is a common problem on those motors and goes bad constantly.
 
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Old 10-08-18, 12:42 PM
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I'm sorry, I meant the possible short at the condenser being the cause of the bad Thermistor.
 
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