so just recently my a/c started cutting off when i press the gas on my truck. it cuts off blowing on the panel and starts blowing on the defroster. a friend said i might have a vacumm leak somewhere.. anyone ever had this problem or might know how i can fix it? any help would be awesome! thanks

 

On the 1997-2003 Models i have heard there is a plastic vacuum line going into the firewall where battery is that can get broken causing your problem...
You did not post truck model or year so hope this helps...

Arlo

 

when you accelerate hard the compressor is suppose to disengage so nothing gets ruined. if it doesnt matter how hard you accelerate then it may very well be a vacuum leak.
could you post the year and motor?

 

its a 2002 with the 5.4. i have a few upgrades but im not sure if they matter or not

 

It is most likely a vaccum leak off somewhere. Either a line, or else the checkball on the line that runs into the firewall. It is designed to hold vaccum in the lines when you mash the gas (since more gas means low vaccum) so your mode doors stay where you want them, instead of defaulting to the defroster vents when no vaccum is present.