Question about 1994 Buick LeSabre

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Air not coming out of vents

My 1994 buick lesare vents don't want to work all the time. i turn vent on it just comes out of defrost. i can be going down road and it will start coming out of the vents. the ac works same way. it works for short time then cuts off and only come out of defrost agan. what can i do to fix this. need the
AC. when it does work it is very cold. AC comes out of defrost sometimes. Not all the time. Can hear AC compressor cutting on and off quickly sometimes. Not all the time. Had system vac and recharged. Worked good until next day. Doing same thing again. No leaks charge is full. This is not a consistent problem. Sometimes AC works good as new. Help before I start replacing stuff.

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  • Rick Williams Jul 14, 2008

    I have checked all lines and put a vac pump on and the problem is still there. Today it worked just fine for about 2 hours. Not continuous driving. Stopping and going in and out of stores. Then on the way home it just starts coming out the defrost. Then, I here the compressor clicking on and off rapidly. Help!!

  • Rick Williams Jul 18, 2008

    I fixed it!!!! I went under the dash and checked all the vacuum lines for leaks and stuff. Since there were no leaks, I decided that if the controls were going to send the air to the defrost vents I would just switch the vacuum lines. I took the one to the defrost and put it on the main vents. It works great!! Now my air is coming out where it is suppose to. For whatever reason, the defrost works too. I can't explain this but it works. If in the future the controls decide to start working correctly, I can just put the lines back like they came from the factory. I guess something has went wrong with a relay or switch somewhere. But now I really don't care because I have AC!!!!!!!!

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  • 6,966 Answers

Hi,

Initially sounds like an intermittent/loose connection, electrical. This of course would include/require check of wiring, switches, connector and relays. The compressor relay would be at the firewall normally near the brake master.

Additionally, the actuators may likewise require checking up. They would normally be behind the glove compartment. The indicator would be, blower/fan motor running but no air on the vents. The actuators are triggered by the vacuum tanks. The tanks are likewise in the engine bay, at the firewall and close to the brake master. The tank would have two (2) lines, one from the engine, the other as earlier stated to the actuators.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 14, 2008

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  • Master
  • 321 Answers

Inside the air box in the interior of the car,there is a door that swings back and forth to direct air flow either to the vents,defrosters,or heat,out the bottom.This door is controlled by a mechanism that is powered by vacuum from the engine.I have seen later models that were little electric motors,but i think your model probably uses a vacuum plunger.Thats the area to look for a problem,if all the underhood vacuum lines check out.

Posted on Jul 14, 2008

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  • Expert
  • 95 Answers

Check under the hood and locate your vacuum lines going in and out of the fire wall, a number of times, vacuum lines can crack and sometimes cracked lines can seal, or leak.

Posted on Jul 09, 2008

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