Question about 1998 Buick LeSabre

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98 LeSabre AC vent

The AC doesn't blow thru the center vents it blows thru the windshield and floor vents that is after the center has been selected. After driving for a longer distance the center vents work at about 50 %

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  • murph1975 Jul 21, 2008

    a/c won't come out of the dash vents. will eventually move to the vents after the car has been running for a period of time. the time is getting longer for the shift to the dash vents. mechanic recommended a $700.00 module. this is on a 1998 buick lesabre.


  • Anonymous Jul 28, 2008

    1994 Buick Lasabre only blows in floor or windsheild no matter mode selected I know how to fix it by replacing the mode door actuator my problem is no part store knows how to find it

  • Whiteviper Jul 31, 2008

    I have the same problem, I checked out the vacuum actuator loacated to the left of the radio. The dark blue vacuum line runs the actuator. I traced the actuator lines backt to a control behind the glove box. I have tried to get that control out but no luck so far.

  • Tammy Rosenfeldt
    Tammy Rosenfeldt Aug 04, 2008

    I have the same problem with my 98 Buick Lesabre, I haven't try anything yet. I may need help. The A/C will only blow on the windshield

  • grousewing70 Sep 14, 2008

    I have a 94 lesabre the air will only blow out of the floor and defrost vent. Any help is appreciated

  • robert2010 Mar 15, 2009

    same problem for me. I moved the vacuum blue, white, orange, and green lines around since I was trying to see if it made any changes. But nope.

    I took a day and opened the whole dash up and the AC unit itself to see if something got stuck inside. NOPE. Freaking A! All the lines look great, the vacuum tank, etc also looks fine.




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It sounds like a vacuume motor that is out or going out also check all vacuume lines for cracks

Posted on Nov 12, 2008

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Where is the lines located

Posted on Apr 29, 2012


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I have a 98 Buick Lesabre Limited. It blows Cool air, but not Cold.And also, I can't seem to make it blow out of the Center Dash Vents.

Cornelius, vent problem could be a pinched or loose vacuum line on controller,faulty AC vacuum motor, faulty AC programmer,etc. needs to be checked out by a good Tech, diagnosed and estimate on repair.
As far as vehicle only blowing cool air, issue could be blend door issue, plugged AC condenser core dirt/debris, low AC refrigerant, plugged AC lines internal, failing compressor, etc., again should be checked out, diagnosed and estimate for repair by a good Tech.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
1998 Buick Lesabre No Air From Dash Vents
Car AC Not Blowing Cold Enough Car Repair Information From MasterTechMark
My Car Is Not Cold What Could be Wrong Elite Auto Repair

Jul 15, 2016 | Buick Cars & Trucks

3 Answers

Heat and air wont blow through vents

The selection door, is operated by 1/4" vacuum hoses. When turning the knob or sliding a lever, to select between floor, vents, or dash deck for windshield defrost, vacuum is created by the valve body and the blower will then blow thru the desired vents. When these hoses/lines are compromised, especially on a vehicle over 15 years old it seems likely, vacuum won't be created, and the last working position, is normally where it stays! Until the lines are replaced.
Good luck.

Mar 24, 2015 | 1998 Buick LeSabre

1 Answer

Air blend door actuator

Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Jul 28, 2013 | 2001 Oldsmobile Aurora

1 Answer

I have a 98 mustang and the air only blows thru the defroster, i checked blower motor, i checked vents, all that looks fine and works but ac will not blow thru vents. i checked firewall where ac lines run...

A lot of vehicles have the heater controls ran by vacuum. Just because the lever moves doesn’t mean the flap inside is. Check for broken vacuum lines to heater.

Oct 15, 2017 | Cars & Trucks

1 Answer

I have a 1999 Buick LeSabre. My AC blows cold air out my windshield and floor vents but not out of my mid or panel vents.

the vents are run on vacuum so if you get the others just not vent sounds to me like you need to find your junction and see if all the hoses are hooked up. mine was passenger side above where ur feet go. All that usually happens is a hose came off and u need to put it back on sometimes they break but u will be able to see once u find it.

Jun 07, 2010 | 1999 Buick LeSabre

1 Answer

A/C only from center vent. Heat from side vents and floor vents.

sounds like the blend motor from hot to cold is stuck open half way allowing both temps to come into the car.

Aug 24, 2009 | 2003 Jaguar S-Type

2 Answers

Why is my ac not blowing hard thru the vents?

check vacuum lines under hood for leaks

Jun 28, 2009 | 1998 GMC Jimmy

1 Answer

No heat - ac stays on blowing through defrost vents

If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Feb 01, 2009 | 1998 Ford Windstar

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