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Buick LeSabre Heating / Cooling

100 messages,  Last post on Nov 12, 2009 at 7:48 PM

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#91 of 100 Re:99 Lesabre A/C blowing out defroster vent [imidazol97] by clearlake Jul 21, 2009 (10:54 am)
Replying to: imidazol97 (Jul 19, 2009 3:38 pm) Well, another day with solid a/c performance. I tested all dash controls, except vent and I don't know why I skipped that one. Everything seems to work fine. Heat out of any vent selected and air out of any vent selected.   I'll wait for a rain shower to cool things off and then button things up.   I wonder how many people have suffered the pain of paying extravagant prices for this repair, or even worse getting rid of an otherwise good car because of the quoted prices.
#92 of 100 98 LeSabre overheating by oldfarmer50 Sep 25, 2009 (3:46 pm)
My son has a 1998 LeSabre with the 3.8L engine and relatively low miles (70K).   He has has a problem with water disappearing from the radiator. He states that he keeps filling the overflow tank but eventually (he wasn't specific ) he gets a hot engine light and finds the tank empty.   I did a quick check and I don't see any leaks from the usual sources (hoses, water pump, radiator) so I starting to think it's the dreaded Intake manifold gasket problem.   I looked at the exhaust and there is some slight white exhaust but this may be due to the system still being cold. I revved it up and didn't see any increase in the white smoke.   So what do the experts think? I'd like to have a better handle on this before he takes it to a shop and gets nailed for $800 to replace that gasket.   Is there any way to diagnose this without any special tools? Replies to this message: mybuick5 (Sep 26, 2009 3:45 pm)
#93 of 100 Re: 98 LeSabre overheating [oldfarmer50] by mybuick5 Sep 26, 2009 (3:45 pm)
Replying to: oldfarmer50 (Sep 25, 2009 3:46 pm) I had the same problem with my 98 buick. They have a weakness in the air intake plenum. It is what sits on top of your eng, that the intake air come into and distributes it to intake ports, It is made of a composite- fiber -sort of like fiber- glass. Near the entrance, driver's side of the eng , there is an egr. valve which is ported into this. that port(which is cast into the plenum) is surrounded with a flow of coolant, The wall between the egr port and the coolant deteriorates with heat and time . Mine failed around the same mileage as your son's. The result is that at first there is seepage into the intake, then as it get worse it will leak enough so that it will drain down into whichever cylinder that the intake valve is open on, when you last shut off the engine, and as a result bind as you try to crank it because it will try to compress the coolant that had built up in the cylinder. In mine I caught it in time so that it didn't end up with a blown head gasket. Everything below the plenum was fine. I just had to replace it . It came with all the necessary gaskets. It is a good idea to drain you Coolant before changing it so that it will not leak into the oil pan as you are working, however it is important to give it fresh oil and filter at the same time. Hope this helps. PS you can examine the old plenum after you remove it. It will probable look charred around that port. It is a hole vertical up into the air intake plenum at the front (driver's side) about 3/4 inch diameter. If you have the means you can cap the other openings for coolant in the removed plenum and pressurize it. check around that port for leakage.
#94 of 100 97 LeSabre passenger heat problem by dan_1997 Oct 09, 2009 (2:49 pm)
I have a 97 Buick Lesabre with Dual Climate control. When I first start the car and turn the heat on it waits to get to a certain temperature and then starts the blower. That is working normal. I only get heat out of the drivers side. The passengers side blows cold. If I turn the temperature down to 60 and back up the 70 then it will start blowing warm air and seems to function normally. I pulled the glove box out to see if there was a loose linkage but everything looks good. What do I look at next? Replies to this message: imidazol97 (Oct 09, 2009 3:55 pm)
#96 of 100 Re: 97 LeSabre passenger heat problem [dan_1997] by imidazol97 Oct 09, 2009 (3:55 pm)
Replying to: dan_1997 (Oct 09, 2009 2:49 pm) The electric actuator on top may have a cracked gear inside. This allows slippage and the programmer (box on the corner of the heater, the computer) loses it's reference. Moving to cold and then back up lets the actuator reset a reference and move again.   You can watch the link for movement while you move the heater control temp on passenger side up and down (with key ON). Actuator has wire connecting to programmer. It has two little screws on top that are barely accessible.   link title   link title
#97 of 100 Lesabre Heat Problem by dm26 Oct 22, 2009 (6:54 pm)
I have an 00 Lesabre with no heat. It has the manual slide system, not dual control. The thermostat is ok, blower works fine and directs to the correct vents when setting is changed. The A\C works. I tried another dash control unit, same issue. Is there a valve or vent door that is not opening? If so is it electrical or vacuum? Is there a way to test? Replies to this message: imidazol97 (Nov 12, 2009 7:48 pm)
#98 of 100 Heater by pcjd388 Nov 12, 2009 (6:43 pm)
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 Replies to this message: imidazol97 (Nov 12, 2009 7:47 pm)
#99 of 100 Re: Heater [pcjd388] by imidazol97 Nov 12, 2009 (7:47 pm)
Replying to: pcjd388 (Nov 12, 2009 6:43 pm) You have two electrical actuators--if you have digital readout with a passenger control AC system.   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.
#100 of 100 Re: Lesabre Heat Problem [dm26] by imidazol97 Nov 12, 2009 (7:48 pm)
Replying to: dm26 (Oct 22, 2009 6:54 pm) There are electric motors that move the vanes inside the heater box.   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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