2012 Ford f150 fan running constantly and very loud only when ac is on and not very cold when it's on soon as I turn it off fan goes off a couple seconds later it's been very hot here in Tennessee I have 3 kids babies so I keep it running constantly when we are in the car husband tried freon nope still doing it he's a mechanic said it could be a few different things causing it but I really would like to just figure it out before him going thru the list it gets expensive buying parts we don't actually need anyone find out why it's doing this it's never done it before he did have to add about a gallon or more of water lat week it was very low that's when this started sometimes the fan will blow cool other days like today it won't just warm air but only on ac not max ac that one blows hot I'm going to try what one suggested and get antifreeze as that's what it needs instead of water it could be low again or like one said it's not reading that it's low it didn't read when he added the water last week either so maybe it's still low and doing this or the fuse but if anyone else has this exact same thing happing to theirs and found the problem please lete know thank you in advance momof3