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#4471360 - 07/26/17 08:26 PM A/C Vent Temperatures
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
2000 Buick LeSabre 3800 V6
From left to right:
Vent 1 78*F
Vent 2 77*F
Vent 3 46*F
Vent 4 51*F
Outside ambient air temperature 100*F.

Low on charge maybe ?
What you guys say ?
Time to buy A/C gauges ?

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#4471363 - 07/26/17 08:31 PM Re: A/C Vent Temperatures [Re: Merkava_4]
dishdude Online   content


Registered: 11/14/08
Posts: 8768
Loc: Phoenix
Driver side blend door isn't closing.
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#4471364 - 07/26/17 08:31 PM Re: A/C Vent Temperatures [Re: Merkava_4]
TinyVoices Offline


Registered: 09/12/16
Posts: 486
Loc: Vienna, VA
Why are 2 vents so much cooler? Which are hot and which are cool?

Saw your edit. And agree with above poster.

My mr2 blows about 48f at 100 degree external temp last I topped the system up.


Edited by TinyVoices (07/26/17 08:32 PM)
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#4471367 - 07/26/17 08:35 PM Re: A/C Vent Temperatures [Re: dishdude]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: dishdude
Driver side blend door isn't closing.


Would that also explain why the two driver vents aren't blowing air as hard as the two passenger vents ?

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#4471377 - 07/26/17 08:53 PM Re: A/C Vent Temperatures [Re: dishdude]
Nick1994 Offline


Registered: 02/19/13
Posts: 10135
Loc: Phoenix, AZ
Originally Posted By: dishdude
Driver side blend door isn't closing.
+1 GM blend door motors to bad all the time.

Might need refrigerant level checked too, my Sonata was 40 degrees out the vents at 107+ while on the freeway today.

Originally Posted By: Merkava_4
Originally Posted By: dishdude
Driver side blend door isn't closing.


Would that also explain why the two driver vents aren't blowing air as hard as the two passenger vents ?


Might be another bad motor, the "mode door actuator" going bad. Not 100% sure though.
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#4471400 - 07/26/17 09:26 PM Re: A/C Vent Temperatures [Re: dishdude]
sleddriver Offline


Registered: 02/06/10
Posts: 4611
Loc: Central Texas
Originally Posted By: dishdude
Driver side blend door isn't closing.
+1
May be the motor or the end of the plastic shaft could have broken. Also be sure that the fresh air on the two warm outlets is OFF.
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#4471467 - 07/26/17 10:45 PM Re: A/C Vent Temperatures [Re: Merkava_4]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: Deplorable in apple valley, ca
Those cars blow cool on one side and warm on the other if the charge is low.
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#4471496 - 07/26/17 11:21 PM Re: A/C Vent Temperatures [Re: Merkava_4]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: NY
I had that same problem on my Jeep a few years back. 2 drivers side vents blew cold but 2 passenger vents blew warm. All it needed was a partial charge.

And I still can't figure why all the vents weren't warm instead of 50/50.
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#4471502 - 07/26/17 11:30 PM Re: A/C Vent Temperatures [Re: Nick1994]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Nick1994
Might be another bad motor, the "mode door actuator" going bad. Not 100% sure though.


There's 3 blend door actuators:
1. Mode Door Actuator
2. Air Mix Actuator
3. Air Inlet Actuator

So far the only one I've replaced is the Air Inlet Actuator; that was when I wasn't getting any warm air at all. So this time I'm guessing it's one of the other two, unless Chris142 is right about it needing a charge.

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#4471534 - 07/27/17 12:26 AM Re: A/C Vent Temperatures [Re: Chris142]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Originally Posted By: Chris142
Those cars blow cool on one side and warm on the other if the charge is low.


Yep my Century does the same thing. It could also be the blend door too
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#4471539 - 07/27/17 12:47 AM Re: A/C Vent Temperatures [Re: Merkava_4]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: MA, Mittelfranken.de
The GTP is colder than my ex wife's heart, 36f at vents @95f, this is the same system as your Buick. Try a charge first.
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#4471604 - 07/27/17 06:39 AM Re: A/C Vent Temperatures [Re: Merkava_4]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18958
Loc: Sunny Florida
Originally Posted By: Merkava_4
Originally Posted By: dishdude
Driver side blend door isn't closing.


Would that also explain why the two driver vents aren't blowing air as hard as the two passenger vents ?


There's the answer.

Blend door malfs are common as a car ages...
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#4471674 - 07/27/17 08:08 AM Re: A/C Vent Temperatures [Re: Merkava_4]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: Deplorable in apple valley, ca
Feel the suction line. If its ice cold its a door. If its cool or warm its under charged.
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#4471680 - 07/27/17 08:13 AM Re: A/C Vent Temperatures [Re: SteveSRT8]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: MA, Mittelfranken.de
Yes absolutely but his temps are warm also. Google provided this little thread, worth looking at.

https://www.2carpros.com/questions/buick-lesabre-2000-buick-lesabre-no-cooling-drivers-side-only
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#4471694 - 07/27/17 08:23 AM Re: A/C Vent Temperatures [Re: Merkava_4]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
90% of the time, uneven temps are due to low refrigerant. I would be checking that first.
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