AC Question

It is probably a broken vacuum hose. This happened to me yesterday. Raise the hood and look for a thin black vacuum hose running along the top of the firewall. it connects to the vacuum tree on the drivers side, it is marked A/C. It runs over to a check valve on the passenger side. I couldn't find any auto parts stores that carries the thin hard line so I replaced it with rubber Vacuum/washer pump line from Pep Boys. Worked like a charm. If that hose is not your problem, check under the dash for a cannister above the gas pedal. A line could have come off of it. Also look behind the glove box for other lines. There is also a vacuum cannister in one of the fenders, passenger I think, make sure it is in tact.

i had the same thing happen to me when i did my heater core. it was a vacuum line that came undone. mine was undone on the passenger side under the dash. its a little block that has a bunch of vacuum lines running to it. i dont know if its in the same place but you might want to check there also