My truck is acting weird. U can b driving down the road with the ac controls turned off. And all a sudden the blower kicks in and blows for about 2 seconds. And goes right back off. Just does it every now and then. Any one ever had this problem?

 

Problem something with wiring and/or sensors.

 

Defrosters on?

 

Everything is shut off. When this happens. But when it does blow it comes thru the defrost

 

Update. When I have the ac blowing thru the vents it blows great. But when I accelerate it starts blowing thru the defrost. Soon as I level out on the gas pedal it comes back on thru the vents. I have been all over the truck and no vaccum leaks. Any ideas????