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The engine computer (PCM) operates the fans by opening and closing the ground for the fans. The PCM will command the low speed fan to come on when coolant temp exceeds 221 degrees.
The fan should always come on whenever you turn on the A/C no matter the engine temperature.
The fan will also operate with the engine off when the engine coolant temp is over 140 degrees.
The PCM will ground all 3 engine coolant fan relays when the coolant temp is 235 degrees or the A/C pressure is too high and run the fans on high speed.
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