I had to diagnose a compressor that would not get up to operating temperature. Originally it was just a 250 hour engine service, but while getting the unit hot I noticed it never got up to operating temperature. I troubleshot to verify the coolant gauge was working properly. It had good power and ground, but I also used a temp gun to make sure what it was displaying was the same as the temperature by the thermostat. I diagnosed it to be a partially stuck open thermostat and got the go ahead to take it apart and find out. Removed all the hoses and thermostat to find a piece of rust that jammed the thermostat. Diagnosis correct.
40hr
80hr
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| radiator tube off and the thermostat is in that coolant |
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| 185 compressor |
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| Had to get the thermostat from John Deere and not Sullivan |
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| You can see how tight the work area is. |
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