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  #1  
Old 30th March 2017
dgsaab dgsaab is offline
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Default HVAC fault

9-7x with the dual temp control auto HVAC.

Just noticed the system blowing hot air on the driver side and cold air on the pass side. Both temps set to 68F, outside it's 51F. I'm guessing 60-63F inside when I did this.

So I played around with the temp control on the pass side and got it to blow barely lukewarm on the pass side when I set the temp to about 79F. That tells me it's capable of regulating, opening/closing doors, etc. Seems like it just doesn't read the actual indoor temp correctly. Looks like off by about 10F.

Does anyone know where the interior temp sensor is for the pass side and does it use a mini-fan somewhere to draw ambient air?

Any other hints to solving my problem appreciated.
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  #2  
Old 31st March 2017
Chili D Chili D is offline
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Default

Same thing happened to me. Not sure where the temp sensor is, but blowing out the drivers side seemed to fix mine.
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  #3  
Old 31st March 2017
nyflapjack2 nyflapjack2 is offline
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Default Recalibrate the HVAC system.

Saab 97x has the GMC dual electronic control system. Mine twice has needed a Recalibration of hvac blend doors, easy fix -assuming your actuators haven't failed.

Just pull the #36 HVAC B fuse under rear seat, wait 30 sec, reinstall, ign key on - not start and wait 2 mins while hvac doors (should barely hear them) move through thier swing limit directions. Do not touch anything else while calibrating.

Bottom is link to YouTube video explaining the steps, it is in the 1st 5:30mins of this video. If you have the louder clicking noises like video well he explains & shows that issue too. The actuators can fail on these GMT360 platform (handy to use that "GMT360" _______issue? when googling a problem for our SAAB-blazers).

The video author is "pfun41" on youtube title "GMC Envoy HVAC actuator replacement", link is:
https://youtu.be/xnIDe0j3Fr4
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  #4  
Old 31st March 2017
dgsaab dgsaab is offline
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Quote:
Originally Posted by Chili D View Post
Same thing happened to me. Not sure where the temp sensor is, but blowing out the drivers side seemed to fix mine.
What does that mean, blowing out the driver's side? Blowing what?
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  #5  
Old 31st March 2017
dgsaab dgsaab is offline
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nyflapjack2:

I did a recalibrate and it didn't help, as I expected. There is nothing wrong with the blend doors. I can vary the temp coming out of the pass side by changing the set temp. The problem is that it doesn't seem to read the interior temp correctly.
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  #6  
Old 1st April 2017
Borntoroll Borntoroll is offline
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A lot of sensors
You need a scan tool that can read those temperatures.
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  #7  
Old 1st April 2017
dgsaab dgsaab is offline
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Thank you Borntoroll. Only 2 sensors for the right (passenger) side. All I have to do now is find them under the dash
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  #8  
Old 1st April 2017
Borntoroll Borntoroll is offline
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Maybe they are meant to be in air ducts?
Also what are you going to do when you find em?
Its probably better to find their outputs by the control module

Last edited by Borntoroll; 1st April 2017 at 01:25 PM.
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  #9  
Old 1st April 2017
dgsaab dgsaab is offline
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From your diagram I'm guessing the 4 sensors in the dash (2 right, 2 left) are mounted to the ducts and measure air discharge temp. Oddly enough the truck only has an interior ambient temp sensor on the driver side B-pillar, no similar sensor on the pass side. Not clear how it controls the pass side temp without it.

What I'm going to do is simple. They appear to all be the same variable-resistor type and possibly the same as the outside one on the radiator support. So I can measure them, they should all read the same resistance. Odd guy bad.

Or I might buy a new one and measure each existing sensor against the new one.

Edit: I may in fact take it to the dealer to get it diagnosed if I can find the time. It's very annoying to take time off from work to do that.
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  #10  
Old 1st April 2017
Borntoroll Borntoroll is offline
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It will be good if it is failed thermistor which is not very promising. It might be wiring issue as well and while you will be hunting them iside the dash you can accidentally "fix" them/ thats why you need a scanner device that can read the values of all temp sensors while not touching them.
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  #11  
Old 1st April 2017
dgsaab dgsaab is offline
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Agreed, but I don't have a scanner so it's either do it the hard way or take it to the dealer. Unfortunately it takes more of my time to take it to the dealer than doing it the hard way so that's probably what will end up happening.
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  #12  
Old 1st April 2017
Borntoroll Borntoroll is offline
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I don't think you need tech2 for this, autel or snapon will probably do the job.
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  #13  
Old 12th April 2017
dgsaab dgsaab is offline
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Had dealer diagnose it, confirmed air duct temp sensor on pass side is bad. Wants $900 to replace, says the dash needs to come out. Not gonna happen.

Does anyone have a link to a how-to or video so I don't waste too much time figuring out how the dash comes out?
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  #14  
Old 30th April 2017
97X Gary 97X Gary is offline
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Default

I had a similar thing happen and replaced my blend door actuator. If its your sensor I would first try removing the bezel, radio and center vents to see if you can access it that way or possible remove the glove box and reach up. Never did a vent temp sensor, let me know how it turns out.
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