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No dash level HVAC 1997 Buick LeSabre #4500775
08/28/17 09:14 PM
08/28/17 09:14 PM
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
csandste Offline OP
csandste  Offline OP
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
Son in law just bought a beater 1997 LeSabre-- 197,000 miles. Runs good-no dash level HVAC. Blender door actuator is easy to access behind glove box, but even when blender doors are moved manually nothing changes. There is air flow on floor and defrost.

So if it's putting out air, and the blender doors can be moved, why is there no air at dash level? Can't imagine that all duct work would be plugged.


2017 Kia Soul Plus-- Valvoline MaxLife Blend 5-20, 48,000 miles.
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4500780
08/28/17 09:19 PM
08/28/17 09:19 PM
Joined: Aug 2003
Posts: 12,896
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,896
NE,Ohio
if there is loss of vacuum they default to that setting IIRC.

Its not like you move one blend door. its a complicated setup.


2019 Jeep Cherokee Trailhawk 2.0T
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4500822
08/28/17 10:16 PM
08/28/17 10:16 PM
Joined: Jul 2011
Posts: 416
Martinsburg West Virginia
71Chevyguy Offline
71Chevyguy  Offline
Joined: Jul 2011
Posts: 416
Martinsburg West Virginia
I had that problem on a 98 lumina before, it ended up being a broken vacuum line by the vacuum ball. It would default to defrost without the vacuum but if you were heading down a hill decelerating, it would switch to whatever the dial was pointing to. I would go over all the vacuum lines you can see. Not sure where that is on the LeSabre. I have a 98 LeSabre , but I haven't had to fiddle with too much of that yet, so not sure where the vacuum ball is so you can trace lines from there.


15 Chevy Sonic RS M1 Dexos1 / Delco filter
99 VW Beetle TDI M1TDT / Mann filter
98 Buick LeSabre PHM + G oil / Bosch filter
85 Skylark 2.5
71 Nova 250
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4500832
08/28/17 10:24 PM
08/28/17 10:24 PM
Joined: Apr 2013
Posts: 5,776
FL, USA
gregk24 Offline
gregk24  Offline
Joined: Apr 2013
Posts: 5,776
FL, USA
My brothers old 1991 Park Avenue with only 115K never blew at dash level either IIRC.


2012 Honda Accord EX-L K24z3
54,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
40,xxx miles
Castrol OEM dealer fill / OEM filter
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4500925
08/29/17 01:57 AM
08/29/17 01:57 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
The blend doors have to be moved in the correct sequence; you can't do that manually.

Verify power and ground to the actuators. The one that doesn't move, replace.

Re: No dash level HVAC 1997 Buick LeSabre [Re: Merkava_4] #4500928
08/29/17 02:03 AM
08/29/17 02:03 AM
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
csandste Offline OP
csandste  Offline OP
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
Originally Posted By: Merkava_4
The blend doors have to be moved in the correct sequence; you can't do that manually.

Verify power and ground to the actuators. The one that doesn't move, replace.


I thought there was only one actuator, behind the glove box. I suspect that ripping the dash out of this thing would cost almost as much as he paid for the car.


2017 Kia Soul Plus-- Valvoline MaxLife Blend 5-20, 48,000 miles.
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4500951
08/29/17 04:43 AM
08/29/17 04:43 AM
Joined: Aug 2015
Posts: 2,720
NC
BigD1 Offline
BigD1  Offline
Joined: Aug 2015
Posts: 2,720
NC
Bought a late 80's one owner Oldsmobile, and the owner said that the heat/AC never did blow right. Dug around in the dash, and somebody from the factory had used too long of a sheet metal screw during assembly, and it was catching the lip of the blend door, and was only letting the blend door open slightly.

Anyway, could be something simple like one of the main ducts disconnected causing it.


1992 Toyota Pickup--Formula Shell 10W-30--Fram PH3614
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501016
08/29/17 07:21 AM
08/29/17 07:21 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
I believe others are correct - when there's no vacuum the blend doors default to defrost/floor.

Pop the tabs in and drop the glove box down, and there's a vacuum manifold behind there - clear plastic in the shape of a revolver cylinder with vacuum lines running to it. The supply line from the engine comes over the HVAC box from the upper/outer side (right under edge of the windshield) - unplug that, start the car, and see if you have good vacuum at that line.

Does the vehicle in question have the lower-option manual climate control or the digital/auto option?


I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501040
08/29/17 08:03 AM
08/29/17 08:03 AM
Joined: Jun 2003
Posts: 17,347
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,347
Deplorable in apple valley, ca
Ya a vacuum leak. Open the hood and look and listen for it.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501067
08/29/17 08:39 AM
08/29/17 08:39 AM
Joined: Jan 2013
Posts: 1,842
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,842
Texas
I worked on the HVAC on our 1991 Chevy Caprice . Do not know how much commonality there is with your 1997 Buick .

ended up having 2 problems .

A - No vacuum to the HVAC controls . Ended up being easier to run a new plastic vacuum line from the " ball reservoir " . Had to follow another path , than the original line .

B - the vacuum switching mechanism behind the HVAC controls was bad . Replaced that .

FWIIW , one of the blend doors was still controlled / moved bu the mechanical cable .


Wyr
God bless
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501101
08/29/17 09:08 AM
08/29/17 09:08 AM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,523
USA
Check the vacuum source under the hood first before tearing into the dash. Very often this is as simple as the hose to the engine being broken or left unconnected.

Re: No dash level HVAC 1997 Buick LeSabre [Re: mk378] #4501182
08/29/17 10:31 AM
08/29/17 10:31 AM
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
csandste Offline OP
csandste  Offline OP
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
"Does the vehicle in question have the lower-option manual climate control or the digital/auto option?"

Only spent a short time looking at car but sure it's a manual, non zoned climate control, though with push buttons. Was struck by how technologically old the car was for late nineties. No gauges or tach, old-timey ribbon speedometer spread across dash, even had white wall tires. OTOH that 3.8 engine pulled well and I was reminded how good it really was.


2017 Kia Soul Plus-- Valvoline MaxLife Blend 5-20, 48,000 miles.
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501226
08/29/17 11:42 AM
08/29/17 11:42 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Are you sure it's a '97? That sounds way too archaic for anything of that body style. And the only climate control systems I've seen is the base equipment with a slider for fan speed and one for temp, and the automatic setup with a digital readout, up/down buttons for temp and fan, and push buttons for different modes (A/C, vent, etc.).


I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: No dash level HVAC 1997 Buick LeSabre [Re: Alex_V] #4501484
08/29/17 04:28 PM
08/29/17 04:28 PM
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
csandste Offline OP
csandste  Offline OP
Joined: May 2002
Posts: 1,369
St. Charles County, Missouri
https://www.google.com/search?q=97+leSabre+dash&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjQ-LzIsP3VAhUGYiYKHaSxAUQQ_AUICygC&biw=1366&bih=649#imgrc=q8ZlsW8JZG_EEM:

I'm sure there's better ways to link this page. Apparently there's two kinds of LeSabre dashes. Those for the old, and these which are for the truly ancient. This is really archaic even for 1997. The other one is much more modern looking. This is the tachless one on the right with the old-timey speedometer. This does have buttons but I don't think zones.

Last edited by csandste; 08/29/17 04:33 PM.

2017 Kia Soul Plus-- Valvoline MaxLife Blend 5-20, 48,000 miles.
Re: No dash level HVAC 1997 Buick LeSabre [Re: csandste] #4501490
08/29/17 04:36 PM
08/29/17 04:36 PM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,523
USA
You can be sure what model year you have by the VIN or the emissions sticker under the hood.

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