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contributions: 1
2003 Ultra where is the temperature sensor located on 3800 engine, cooling fans do not come on until A/C is started.


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contributions: 1898
Images: 37
Location: Oregon
left rear of the engine under the thermostat housing.

the fans should not come on until the engine reaches 212F for the low speed fan and 226f for the high speed fan. the ac will turn the low speed fan on when the pressure hits 190psi and the high speed fan at 244psi.

if your engine does not hit 212f the fan will not come on with the ac off


   
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