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Buick LeSabre Heating / Cooling

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

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#88 of 100 Re:99 Lesabre A/C blowing out defroster vent [imidazol97] by clearlake Jul 19, 2009 (12:20 pm)
Replying to: imidazol97 (Jul 17, 2009 10:50 am) I've made the tubular bypass, hooked up the electrical connectors and re-connected the lever at the bottom of the programmer.   I started the car and turned on the air. Voila, there's cold air coming out of the dash vents. Selecting windshield/floor works too. No more tests. I'll drive it awhile before re-installing the hush panel and glove box. I'll test heat and vent etc.   thanks again,   ClearLake Replies to this message: imidazol97 (Jul 19, 2009 3:38 pm) clearlake (Jul 20, 2009 12:31 pm) clearlake (Jul 21, 2009 10:54 am)
#89 of 100 Re:99 Lesabre A/C blowing out defroster vent [clearlake] by imidazol97 Jul 19, 2009 (3:38 pm)
Replying to: clearlake (Jul 19, 2009 12:20 pm) Great! Glad it worked.   Did you use rubber gas line to connect the vacuum hoses or aquarium line?   Thanks for coming back to tell us it worked or didn't work! Replies to this message: clearlake (Jul 20, 2009 12:31 pm) clearlake (Jul 21, 2009 10:54 am)
#90 of 100 Re:99 Lesabre A/C blowing out defroster vent [imidazol97] by clearlake Jul 20, 2009 (12:31 pm)
Replying to: imidazol97 (Jul 19, 2009 3:38 pm) I could not find aquarium line small enough to make a tight connection. I tried some shrink tubing and it was not tight enough to stay on during the re-installation of the programmer.   I noticed that either GM or the mechanic who did the repair before had used a 1/8in or smaller inner diameter vacuum line to splice the lines coming from the actuator motors (I assume) and going into the clear connector plate (female part). This splice was about 3 to 5 inches before the lines entered the female plate. So I went to my local AutoZone and they finally found some of the same size vacuum line. The outer diameter looks a bit larger than the other, but it makes a very tight fitting. I used 4-5in sections for the connections to give me some room and I tie-wrapped the bundle near the programmer.   I'm now wondering whether or not to worry about sealing the opening left by the old joined female/male connector plate at the lower left corner of the programmer.   I gave the cooling settings a good test today and no problems. I need to do the same for the heating adjustments.   I did notice that the programmer motor driven lever at the bottom of the programmer moves with the temperature settings. I still don't know what vacuum lines are opened or closed for the various other dash control buttons. I'm just interested, after seeing how the solenoid manifold works.   Thanks again for staying with me through this. By the way I just turned off the a/c at the dash before disconnecting the front and top electrical connections, being careful to pull straight out on the connectors. The top was easy, the front took me some figuring out, but I made it with the help of a small flat blade screwdriver to carefully pry the locking arms outward.
#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)

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