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#4655759 - 02/04/18 11:04 AM silverado heater issue..
OtisBlkR1 Offline


Registered: 06/03/09
Posts: 3247
Loc: Indiana
So, yesterday my 2006 "garage queen" Silverado did something new. I warmed up the truck, turned on the heat and drove a few miles with the heat working. I noticed I was getting cold air out of the driver side vents after about 5 miles, its equipped with the dual zone temperatures. well the passenger side worked correctly however the driver side blew out cold air. I turned the heat off/on several times with no good results. after I made a stop and restarted the truck after a few hours it was working as it should again. this is the first time this has ever happened. extremely well maintained/over maintained truck. 92,xxx on the clock. any ideas ?

Also on a side note.. likely unrelated, the battery gauge on my truck usually reads right about/above 14 and the battery is 2 years old. I hook up a trickle charger about once a month to keep the "garage queen" topped up on juice.. I have noticed the last two outings in the truck that the gauge has been reading at a higher level than usual. even after 20+ minutes of running.. I can account for a higher read as its topping the battery up after sitting for some time. Ive owned the truck since 2006, second owner and like to think I know its behavior fairly well.

again, ideas ?
_________________________
06 Silverado 92,xxx Mobil 5-30
11 Honda Accord 38,xxx Mobil 1
06 Milan 69,000 Mobil 1
12 Ranger 800XP & 14 TRX 450R


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#4655766 - 02/04/18 11:09 AM Re: silverado heater issue.. [Re: OtisBlkR1]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Blend door motor is going bad. Its plastic gears strip.
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02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
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#4655775 - 02/04/18 11:15 AM Re: silverado heater issue.. [Re: Chris142]
OtisBlkR1 Offline


Registered: 06/03/09
Posts: 3247
Loc: Indiana
that crossed my mind, so with dual zones, the trucks going to have two blender doors ? are these both on the same unit ? like if I get it replaced does it cover both sides.. I don't know much about this topic im afraid.. two years ago the blender door on my Milan did the same thing.. $245 the car was happy again..
_________________________
06 Silverado 92,xxx Mobil 5-30
11 Honda Accord 38,xxx Mobil 1
06 Milan 69,000 Mobil 1
12 Ranger 800XP & 14 TRX 450R


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#4655802 - 02/04/18 11:29 AM Re: silverado heater issue.. [Re: OtisBlkR1]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
No there are 2 motors and 2 doors.
_________________________
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

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#4655811 - 02/04/18 11:39 AM Re: silverado heater issue.. [Re: Chris142]
OtisBlkR1 Offline


Registered: 06/03/09
Posts: 3247
Loc: Indiana
so just have them done as needed ? (are they easy to access ? shop job labor ) or do them both in one shot ? thanks for the input
_________________________
06 Silverado 92,xxx Mobil 5-30
11 Honda Accord 38,xxx Mobil 1
06 Milan 69,000 Mobil 1
12 Ranger 800XP & 14 TRX 450R


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#4655881 - 02/04/18 12:35 PM Re: silverado heater issue.. [Re: OtisBlkR1]
Drosselmier Offline


Registered: 03/12/15
Posts: 178
Loc: Ontario Niagara region

For a good understanding of GM charging system, Check out this site.

http://www.agcoauto.com/content/news/p2_articleid/350

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#4655932 - 02/04/18 01:16 PM Re: silverado heater issue.. [Re: OtisBlkR1]
Kibitoshin Offline


Registered: 04/19/16
Posts: 689
Loc: Kaiōshinkai
Here's a video to help understand GM's dual zone climate controls and various blend doors and how to get to them.
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Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi

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#4655989 - 02/04/18 02:17 PM Re: silverado heater issue.. [Re: OtisBlkR1]
AntsinmyEyes Offline


Registered: 08/09/15
Posts: 199
Loc: Colorado
if the air temperature was low outside then the pcm probably increased the charging voltage.
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1987 mazda rx7
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#4656191 - 02/04/18 06:21 PM Re: silverado heater issue.. [Re: OtisBlkR1]
clinebarger Offline


Registered: 12/19/13
Posts: 1900
Loc: Fort Worth, Texas
My 2006 Silverado does the same thing once or twice a year, The left temperature blend door will swing out of it's calibrated range.....Shutting the engine off & restarting will correct it.

It's done this for years.....I'm still on the original blend door actuators at over 370,000 miles.

Unless it's starts doing it often....I would leave it be!!!
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2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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#4656581 - 02/05/18 06:24 AM Re: silverado heater issue.. [Re: OtisBlkR1]
Silverado12 Offline


Registered: 02/26/13
Posts: 3111
Loc: Central Virginia
I've seen the actual controls on the dash go bad too. I wouldn't just assume it's a blend door.


Edited by Silverado12 (02/05/18 06:25 AM)
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12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
16 Challenger R/T Shaker 5.7 manual B5 blue
07 Harley Dyna Street Bob 96 c.i. 6 sp.
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#4656922 - 02/05/18 12:40 PM Re: silverado heater issue.. [Re: OtisBlkR1]
MarkM66 Offline


Registered: 10/19/10
Posts: 1542
Loc: stl
Re-Calibrate before even looking under the dash.


https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj4mceLto_ZAhVuplkKHTKkCocQtwIIKTAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DgrF8aRtgu1I&usg=AOvVaw2fziVjuNHdmzftWGfrlYfD


I have a Traverse that was acting up. Thought it was a bad blend door actuator. But resetting the controls fixed it.

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#4661759 - 02/10/18 09:50 AM Re: silverado heater issue.. [Re: OtisBlkR1]
OtisBlkR1 Offline


Registered: 06/03/09
Posts: 3247
Loc: Indiana
good input, ive got the truck out 3 times this week and its not acted up again .
_________________________
06 Silverado 92,xxx Mobil 5-30
11 Honda Accord 38,xxx Mobil 1
06 Milan 69,000 Mobil 1
12 Ranger 800XP & 14 TRX 450R


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