[Nathan Plemons]

Slowly but surely my truck is starting to show it's age. Recently the A/C has taken to transferring itself to the floor if I go up a hill without downshifting out of 5th gear. As soon as I top the hill and/or let off the throttle, it comes back to the upper vents.

This sounds like a classic vacuum leak to me. Any opinions on where to start looking? Does this seem like it would be under the hood, or under the dash up near the HVAC controls?

I guess what I really need to know is if this is a particularly common problem, and if so, where's the most common leak?

Thanks!