The fan on my 2000 Dodge Ram quits blowing whin I go up a hill or when accelerating a little bit. When I take my foot off the gas it starts back and I can hear what sounds like a door (vaccum?) closing. I checked again today and noticed it is blowing out of the defroster vent when not blowing out if the ac vent.

Any ideas what to check.
Thanks

 

Bump

 

Ya, you have a vacuum leak somewhere, but finding it can be the hard part. Do a search on this forum for vacuum leak, and see where others have found their leaks at.

We need a sticky on this where people can post where they found their vacuum leaks so others have an idea of where to look if they discover they have a vacuum leak. Mine was on the vacuum line that runs along the passenger frame rail next to the exhaust. The exhaust heat had burned a tiny hole in the vacuum line. It was cheap and easy to fix.