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Sedans Buick LeSabre Buick LeSabre Heating / Cooling
107 messages, Last post on Dec 04, 2009 at 5:30 PM
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I have a 97 lasabre that when you have the heat on the floor setting, it will blow out hot air on drivers side floor vents, but will blow out cool to cold air for the passenger side floor vents, what could be the problem making it do this? Any help would be appreciated  The same goes when you have the mid level vents on as well
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Replying to: pcjd388 (Nov 12, 2009 6:43 pm) One controls the driver's side temp One controls the passenger side temp Take off the hush panel above the passenger's legs. On the bottom of the heater box is a white lever that comes out of programmer box. It snaps onto a small rod that has ridges on it like screw threads. it may be unsnapped. Or the motor for the plastic link is not working. The actuator on top of the heater box close to the top of the programmer also actuates a vane inside the heater through a small rod. Check to see if one of these work when you operate the temp control for driver (main) and then check to see if the other work move when the passenger control is varied. Be sure to have the key ON when trying this. The actuators may have cracked a gear inside the box. The actuator for the lower one is inside the programmer box which has all the vacuum tubes coming out of it. I assume it requires replacing the programmer. I forget which one, top or bottom, controls which temp. You may want to take off the glovebox lid by removing 6 screws along the bottom. I think that makes it a lot easier to see. And I think the lower lever is kind of protected by a snap on shield. |
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Replying to: dm26 (Oct 22, 2009 6:54 pm) For most if I understand poster's comments, the axles are white and you can see them move in response to different commands from the controls with the key ON. Take off the hush panels under the dash to see the controls. You may need to look on driver and passenger side both. |
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My 2002 Buick Lesabre heater is blowing cold air only. Would this just be the thermostat?
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My 2002 Buick Lesabre makes a sloshing sound usually when the car first gets going. Some fluid is "sloshing around but I'm not sure what is causing this. At first I thought it might be the gas tank but it doesn't matter if tank is full or not. It sounds like it is coming from the engine or dashboard area.
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Replying to: stan67 (Dec 04, 2009 6:56 am) If it's really warm, and you can tell which hoses go to the heater back on the firewall, touch each of them after the engine has been running and the blower fan is ON high. TURN the motor off before reaching around because of the fan belts. Both heater hoses should be about the same temperature if water is flowing through the heater core like it should. Look at your reservoir tank for coolant. Is it a nice orange? Or orange with a hint of brown tone because of the sealer put in the car in 03 for a recall that GM did to use a sealer again that wasn't put in at the factory. If the coolant is sludgy looking and dark, perhaps oily looking on top, you might have a problem with DexCool that was contaminated with regular coolant and is clogging up. Sometimes the heater cores can clog easily with goop. But most likely you have an actuator motor that is dead or stuck. They move the vanes inside the HVAC box inside the car. I can't isolate which one is likely for the temp unless you tell me you have an automatic system with digital readout or a manual system without the digital readout. Here's a link to a pict showing two or the actuator motors. Notice they have a small circle at one end in white that's the end of the rotor. So with the key ON, motor off, you can change settings on the temperature, air direction, etc., and the actuators will move. If they don't, people say they come off easily with a couple of screws and you can buy news ones at a dealer or by internet. This is a picture I found on the net. It is not my picture. Thanks to whoever took it. It is a heater box without the dash around it. You can access this by taking off the thin plastic covers under the dash, left and right sides. A few screws. Carefully remove them. Notice in the picture you can see the white plastic arms that move th vanes inside the box. I don't know if you can see them in the car or not. I do not know if the temperature blend door (changes from warm to cold) is on the left or the right for your car. I suspect left because on a dual system one on the right would control the passenger side of the HVAC box. http://i86.photobucket.com/albums/k110/imidazol97/IMG_6576.jpg
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Replying to: stan67 (Dec 04, 2009 7:00 am) This might be low water level inside the radiator allowing air to get into the heater core. Then when you start the motor the coolant eventually gets pushed up and through but the air makes a gurgling sound which should leave. You'll need to check the radiator by removing the cap when COOL after sitting for at least half an hour to cool down. The radiator should be full. ANd the reservoir should be up to the cold mark and higher. If the radiator is low that means the system isn't sucking coolant back from the reservoir like it should. You'll need to find problem source such as leaking water pump, or plastic coolant elbow on hoses to heater, or radiator hose leaks. Water from the AC condensing can not drain out of the HVAC box and slosh around when going around corners. Water can be leaking in through sun roof drains and collect on floor in car, front and then back. Check carpets for squishing. Check under the front seats. Check inside the trunk. Water can leak in through the doors if plastic inner layer isn't sealed, often after work was done in door and the sealer wasn't replaced and they just stuck the plastic layer back on. |
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Replying to: imidazol97 (Dec 04, 2009 8:30 am) |
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I have a 1997 Buick Lasabre and the temperature readout that is in the car blinks when we start the car up. When we have to turn the heater on, hot air will blow out on the driver side, on the floor like it should but on the passenger side it will blow out cold air. Why would it do that and how can I fix this. It doesn't matter if its the vents or floor or mid level, it's all cold air on passenger side.  
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