92' Lesabre a/c flows thru defrost vents only

My 92 Lesabre a/c flows only thru the defrost on the dashboard and underneath where the heatear ducts are.
this started happening after the radiator was replaced. I just had a mechanic put in a new a/c kit and its still doing the same thing. The mechanic said he had checked for vacume leaks and didnt find any. He then told me it needed a new control unit, I put one in but the same thing is happening!!
Can somone please help??

Thx

My 92 Lesabre a/c flows only thru the defrost on the dashboard and underneath where the heatear ducts are.
this started happening after the radiator was replaced. I just had a mechanic put in a new a/c kit and its still doing the same thing. The mechanic said he had checked for vacume leaks and didnt find any. He then told me it needed a new control unit, I put one in but the same thing is happening!!
Can somone please help??

Thx

The unit defaults to defrosters when there is no vacuum. Hope that's the actual problem since it can be the simplest.

Check on your firewall in front of the driver in the Relay Center for a plastic box that's the vacuum storage container. There should be two rubber tubes out the bottom if I recall correctly. I don't have any pictures. Messing with the rear plugs on the motor I always pulled off the one vacuum hose. It carries the vacuum to the interior for the AC/heater controls. You can run the motor and pull off the tube if it's connected to be sure you have vacuum in the tank. It should store vacuum for a part of a minute after the motor is turned off. Sometimes that storage container can be cracked.

From there follow the vacuum line to the passenger side of the car and into the interior. Check to be sure there is actually vacuum in the line as your go.

Then take off the hush panel above the passenger's feet area. Follow the black line into the compartment and to the control box. ...

Post back what you find.

You were absolutely right it was there was a vacume tube that was disconnected at the firwall just like you said.
I cannot believe that this mechanic had told me he had checked the lines!!
just for the heck of it I left a message on that mechanics voice mail saying that I still had the same problem. He replied in my voice mail that thay were going to have to dismount my dash and it would be $500 more!!! Thanks Much.
If anyone knows an honest mechanic in Phoenix, AZ please let me know!

Thank you were absolutley right!!
I can't believe the mechanic had missed that. There is no way!!
Thx Again

Thank you were absolutley right!!
I can't believe the mechanic had missed that. There is no way!!
Thx Again

Thanks for coming back and letting us know what you found. It will help others who find this using search on the forum...

I knocked that tube off any time I did something around the back of the motor. I never did learn to check it after I had the hood open. I'd always find out I had to vacuum to the heater controls then go look for the problem.

Hey, I just want to say that this helped me out a wholllle lot! it solved my very problem! Thanx you guys!!! man!! its been steadily around 100 degrees here lately in kentucky and i just thought i was gonna die driving around in that heat wondering why air was only blowing out of my defrost. Now I know why and its fixed!!! Thanx again! Automotive forums is awsome!

If anyone knows an honest mechanic in Phoenix, AZ please let me know! This is not an advertisement but, if you ever have AC problems in Phoenix, AZ, this would be the place to go!
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Thanks for your posts. We have a '90 Buick LeSabre. A/c was also flowing through the defrost vents only. We checked around the motor area on the driver's side and noticed a rubber connector that had come loose and was beginning to rot. We replaced the connector and the problem is solved. Thanks for pointing us in the right direction. My wife and I are not mechanics, but your advice saved us time at the autoshop and solved our problem. We have a/c again thanks to you!

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