A/C and heater only works on passenger or drivers side?

Tiny
CHUCK ROETHKE
  • MEMBER
  • 2014 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
A/C works fine in manual both sides. Does the climate control need to be replaced?
Tuesday, July 9th, 2019 AT 5:48 PM

44 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Welcome back. It sounds more like one of the temperature sensors for that side has an issue. There are two per side, one in the upper duct and the other in the lower. The best way to determine where and what is the issue would be to put a dealer level scan tool on the truck and see if there are any error codes in the HVAC system. Then hope it isn't a failed upper sensor. To replace those the instrument panel is removed so you can get to the sensor mounted in the duct.
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Tuesday, July 9th, 2019 AT 7:46 PM
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
Bad actuator drivers side on top try to do it myself dissemble dash or have a shop do it $370.00 and I buy the part.
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Thursday, July 11th, 2019 AT 11:07 AM
Tiny
CHUCK ROETHKE
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The lower ones are easy. Need instructions how to replace upper.
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Thursday, July 11th, 2019 AT 11:20 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Well the easy way uses a saws-all but it's a bit extreme. Did it say which actuator or give you the part number, there are two on top, one is the mode actuator the other is the temperature door for the passenger side. The mode control can be changed without removing the dash, you remove the HVAC duct over the drivers foot-well and reach up in to remove the two screws from the actuator. It's also possible that the problem is the actuator cams that it moves, that could explain why it works in manual mode. The cams are plastic and have been known to fall off they are under the actuator on a plastic bracket.
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Thursday, July 11th, 2019 AT 1:18 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Can you see the cam links behind it? They have a bad habit of coming free. The only other items on top of the HVAC case are the temperature control for the passenger side (pic1). But if the AC works on that side then it should be working. The other item is the air inlet actuator, it controls the door for re-circulation or exterior air (pic2). The temperature control actuator for the drivers side is on the bottom of the unit in the passenger footwell (pic3).
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Friday, July 12th, 2019 AT 7:33 AM
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
Thank you the problem is fixed.
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Friday, April 30th, 2021 AT 11:43 AM
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
  • 2014 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
Driver side ac lukewarm not cold like passenger side actuator problem? Or something else?
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

If you have dual climate control, it sounds like the blend air door actuator isn't working. The actuator is located under the dash on the HVAC system.

Here is a link that explains in general how to replace one:

https://www.2carpros.com/articles/replace-blend-door-motor

What I suggest is to confirm that the actuator isn't operating and replace it if it isn't.

Let me know if I can help. If you need specifics, let me know if the system is an automatic or manual climate control.

Take care,
Joe
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
The one under the dash on the passenger side controls the passenger side drivers side isn't working.
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

According to Alldata, with automatic climate control, the left side actuator is located just to the left of the glove box. The directions provide are in pics 2 and 3. In pic 1, I highlighted what I am seeing.

________________________________

The last thing in in pic 3 indicates calibration. I looked up the process for you and found this for doing it without a scanner.

Alternate Method (without Scan Tool)

Note: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

1. Clear all DTCs.

2. Place the ignition switch to the OFF position.

3. Install the HVAC actuator.

4. Connect all previously disconnected components.

5. Remove the HVAC control module fuse for a minimum of 10 s.

6. Install the HVAC control module fuse.

7. Start the vehicle.

8. Wait 40 s for the HVAC control module to self-calibrate.

9. Operate system and verify that no DTCs have set as current DTCs.

________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
  • 2014 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
Driver side A/C not as cold as passenger side. Intermittent problem sometimes it works more less.
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I attached a picture of the actuator and the procedure for you to follow with diagrams below .

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (Below). Please let us know what happens.
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
  • 2014 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
How do I know which actuator to replace there are four of them? A/C not as cold on drivers side or is the climate control going bad?
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

I attached directions for replacement of the actuator specific to the left side. The attached pictures correlate with the directions. First, here is a link that explains the process in general:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are the specifics:

TEMPERATURE VALVE ACTUATOR REPLACEMENT - LEFT SIDE (CJ2)
Temperature Valve Actuator Replacement - Left Side (CJ2)

pic 1

pic 2

Let me know if this helps.

Take care,
Joe
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
CHUCK ROETHKE
  • MEMBER
  • 14 POSTS
Does a code reader pinpoint actuator problems?
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

If you have a scanner that can read HVAC codes, it should point you in the right direction. As you mentioned, there are several. One is for fresh air / recirculate, one is a mode actuator which directs the air flow direction, and then two for temperature, one for each side.

Joe
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Friday, April 30th, 2021 AT 11:44 AM (Merged)
Tiny
G_SPERAN
  • MEMBER
  • 5 POSTS
  • 2011 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
This truck is the 1500 model. After replacement of a drained battery, the driver side AC circulates between warm, cool, and cold approximately every ninety seconds while the passenger side works properly. Based upon research, it seems that this is a common issue and that a fix may be to. 1) initiate a re-calibration using a scan tool. 2) perform some steps that require removing a fuse, adjusting the temperature, shutting the truck off, etc. I have done each of the recommended procedures, however I am still experiencing the same issue. We also tested the A/C unit for leaks by draining the Freon, measuring the capacity, then replacing it back into the system. The Freon level was at proper lbs therefore proving no leaks in the AC system. Any idea's of what may need to be replaced to resolved this issue or other steps to try to rectify the issue?
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Friday, April 30th, 2021 AT 11:46 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, there are four actuators. The one you need is on top of the heater case. I attached a picture for you to view. To access it you need to remove the passenger side airbag. It will be visible when that is removed. Make sure you disconnect the battery before this repair.

Roy
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Friday, April 30th, 2021 AT 11:46 AM (Merged)
Tiny
G_SPERAN
  • MEMBER
  • 5 POSTS
Hello Roy,
Thanks again. I am assuming that this will require the removal of the dash, correct?
If so, without having to purchase Chilton or Haynes manual, and references that you may know of that will walk me through step by step on how to accomplish this task?

Thanks,
Gary
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Friday, April 30th, 2021 AT 11:46 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The drivers side is an easy replacement. I sent you the procedure for the passenger side. Sorry about that.

Nothing to remove but the cover under the left side of the dash. That is held by a couple of screws. The blend door actuator is right there. The correct picture attached.

Roy
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Friday, April 30th, 2021 AT 11:46 AM (Merged)

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