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first turn on the truck turn on ac if the fan doesnt turn then pull the harness and check for voltage if there is none check fuses and relays if there is then fan is bad
That is normal.
The fan motor has failed and will need replaced.
Most likely either the switch or the motor is defective.
Why does your ac and heater fan turn off and on
bad motor or capacitor
possibly reversed wiring or perhaps a bad PCM, the PCM is supposed to override the sensor and turn on the fan anytime the AC is on.
as soon as the ac is turn on the cooling fan should come on if not there is a problem with that take it to a ac shop thay can find it fast ..
There isn't one! Insted you go to the factory and get a fan. turn the fan on and turn to the robot.
You can turn the temperature of the AC up but if you turn the fan part of the AC up "high" or "low" it will only make it colder.
Broken fins in the fan or a bad compressor. Or leaves and sticks stuck touching your fan for the ac side (assuming you have a separate fan for ac which you might not).
Your car fan turns on when you have your air condition unit on because, your engine heats up more when the air is on so the fan needs to come on to cool the engine down.