air conditioner
Junior User
Joined: Jan 2002
Posts: 72
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From: Oshawa Canada
air conditioner
If your system has vacum operated vents, chances are that you may have a broken or blcked vacum line. The system is designed that if it loses vacum it will go to defrost for saftey sake.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
air conditioner
What is the year? If mechanical rather than vacuum operated, you may have a loose cable on the mode door lever. Remove the gizzards of the glove box, and look under the dash with a flash or trouble light. While you are moving from panel to defrost, look to see what is moving under the dash on top of the heater box. you should see a lever moving around, if you have cable operated mode door. It mmau have fallen off its proper spot. You should hear vacuum squishing around if you have vacuum operated mechanism, and would see bulby looking things with a flat shaft sticking out that was connected to a door flap. If you don't hear anything, or see anything moving, check for vacuum at the mode switch and if you don't have vacuum, follow the vacuum hose back through the firewall to the reservoir, and the connection to the intake manifold. Look for a loose hose, or a broken hose making sucking noise as the engine idles.
tom
tom
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