Question about 2000 Buick LeSabre

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No heat no matter if defrost vent or heat is selected the heat will not work when the control is slid to heat

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  • Anonymous Sep 24, 2008

    NO HEAT

  • dadfife Oct 09, 2008

    This is the same type problem but it is an automatic temperature system. The hoses going and coming from the heater core are hot but only cold air comes out as it tries to warm the car. It does sense heat is needed and turns on the fan and shows proper direction of the vents.

  • titoburrough Oct 13, 2008

    2002 buick lesabre when i slide to heat i get no heat.

  • flea68 Nov 02, 2008

    2002 Buick Lesabre Custom. After pushing the heat button and sliding the temperature lever to hotter I get nothing but cold air. How does the dash come apart?

  • Anonymous Dec 28, 2008

    The heater is barely producing heat in the car when it is all the way to high heat.

  • Anonymous Jan 18, 2009

    Yes I have the same problem is amazing and makes me feel good in the winter.

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  • Buick Master
  • 61,037 Answers

You have a blend door problem, either the door is stuck or the actuator that moves it is defective. In order to access this area for repair the dash must be removed.

Posted on Sep 24, 2008

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My air condition and heat works on defrost only sometime comes out vents last seconds didn't matter were controller set


Not sure what year, make or model vehicle is in question, but the issue is due to an actuator that has gone bad. Sometimes referred to as a mode actuator or blend door actuator. This actuator controls where air/heat will blow from (defroster vent, forward vents, floor vents or combo, etc.). Good luck. Ron @ Speed-O-Repair.

Aug 24, 2014 | Cars & Trucks

1 Answer

Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

Jun 28, 2011 | 2006 Chrysler PT Cruiser

1 Answer

My 1996 Jimmy had the blower motor and heater core replaced and now the air will only blow out of the top defrost vent no matter what vent is selected for A/C or Heat. The vents were working before he...


If I remember correctly the mode door is vacuum operated. Check to make sure that there is vacuum to the control head. If not is is possible you knocked the vacuum line off when replacing the heater core. The default position for a vacuum controlled mode door on just about every vehicle is the defrost position. This is so if there is a failure in the system you will at least still have a clear windshield to see through.

Jan 21, 2011 | 1996 GMC Jimmy

1 Answer

Ac only blows through the defrost vents no matter what the controls are set to the air only comes out the defrost vents.


the blend air door is stuck look down the heat vents to see if something fell in there

Jul 11, 2010 | 2004 Dodge Dakota

1 Answer

CANT ADJSUT THE CONTROL ON HEATER AND AIR


The controls for your heater/vent selection is inside the dash, behind the control switches you use to select the vents the heat/AC will come out.
When you move the selection levers, there's a few things that happen. Vacuum is applied to the doors (which are inside) and they open or they work using cables to move the doors or both. The different doors open, directing air flow to the vents selected.
Remove the controls from the dash (which should just be removing some screws, maybe a few small pieces of dash and pulling it out). The controls will be connected inside so they will not come out very far.
Just check to see if anything is disconnected and try operateing the controls with the heat on to see how they work.
Sometimes they just stick or the doors stick. This system is the way the 1991 models worked but since they are the exact same, it should be this way also.
Look it up in some sort of repair manual for more info. I find with these trucks, they don't heat very well using the front vents anyway. I find using the bottom vents work best for heat unless you need defrost.
The "heater" selection will atomatically use the bottom vents, "bi-level" AC will use the front and bottom vents if I remember right and regular AC will automatically use the front vents. For the trouble in removing these controls (the whole dash would need to be removed for repair) I probably would just live with the way they work if they do work atleast properly (enough heat and AC). If you find that you don't get enough heat or AC when in use, check the cooling system for proper operation and blockages/mineral buildup and check the AC system incase it needs recharging or you have leaks.

Apr 12, 2009 | 1992 GMC Sonoma

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

2 Answers

'04 Jeep Grand Cherokee: Heats...but only through defrost vents.


Check the control cable that operates the diverter door in the heater box at both ends, to make sure that it operates the door when you move the control lever.

Jan 15, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Heat or air only comes out from window defrost.


try changing your whole heater switch unit that should work

Dec 09, 2008 | 1997 Chevrolet Blazer

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