Greetings all
Here is a real head scratcher. I turn the air on and the fan blows nice cold air for about 20 minutes. Then the air stops coming out the vents but you can hear the fan running somewhere. If i stop the truck for an hour or so and crank it back up, the fan is normal again until 20 minutes and we start all over again.
Anyone ever experience such?

 

with my truck its weird. like itll be going, then you it goes low and comes back on normal. bro says something about so many rpms or something. i dunno, not sure. it did it on his mountaineer also.

 

Next time it stops coming out the dash vents place your hand over the defrost outlet and the floor outlets and see if you feel the air coming out of them.

 

agreed, do that

mine worked fine until i reached a certain rpm/speed (i dont remember which) then cut out.

i had a vacuum leak