Why does your ac and heater fan turn off and on
because it is going through defrost cycle
could be a shorted fan,try unplugging the fan and turn on the ac and see if it still blows,dont run it too long with the fan disconnected because the ac pressure increases because the freon is not being cooled.
Check the temp sensor. Also, if the AC compressor is on the radiator fan will be on, so turn off the defroster and the AC.
First check your fuse for your AC in your fuse box, make sure it is good. Make sure your cooling fan is turning on when you turn on your AC, if not it could be your fan relay. If the AC compressor fan clutch is kicking on and off then it just needs freon. If the AC compressor fan clutch is not turning then it could be completely out of freon due to a leak, or you need a new AC compressor.
Start out by checking the a/c blower and the blower resister.......
YOu have your air on to high and the fan is malfunctioning I would turn your ac off
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).
I have the same problem and got scared because i took the key out and thought the engine was still on, it means you left your air conditioning fan on, go inside and turn the ac fan off
it depends what car u have but on most fords there is a button tht says A/C When tht button is on ...the A/C Will Work With The Fan ...When the fan is on the A/C is Also On So Make Sure The Switch Is Off When You Turn Ure Fan On .....Good Luck Tha ac turns on when in defrost because the ac dries the air out, and drier air cleans the windows faster.