2019 Terrain Denali auto start/ stop quit working! - Page 2 - TerrainForum.net: GMC Terrain Forum
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post #11 of 15 (permalink) Old 02-01-2020, 08:31 PM
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I think having a/c on max will not allow as to operate.

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2010 Equinox LTZ 2.4 L 4 cyl, FWD, S/R Cardinal Red/Black
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post #12 of 15 (permalink) Old 02-04-2020, 04:48 PM
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Quote:
Originally Posted by Colt Hero View Post
As kowal_joe mentioned, keep an eye on your A/C usage and STOP/START “working/not working”. I don’t have this feature on any of my vehicles, and I’m gonna try to avoid it with my next new vehicle purchase, but I’m pretty sure I’ve read here that use of A/C deactivates STOP/START.

You may have had a battery issue, but your use of A/C may have also been disabling STOP/START. Two “issues” at the same time...
A/C operation doesn't deactivate the stop/start system. The system takes into account cabin temperature, sun load on the dash sensor, fan speed, outside temperature, etc. to determine whether or not to shut the engine off or not. My 2019 2.0t follows roughly the following (climate control in auto for all conditions):

1. 95+ degrees - never shuts off
2. 80 to 95 degrees & bright sun - shuts off rarely
3. 80 to 95 degrees & low sun/clouds - shuts off frequently & restarts within 35 to 40 seconds

Below 80 degrees (and remember, these are approximate temp levels) the system activation is strictly potluck. In Tucson we can have bright sun on a 60 degree day that will keep the engine from shutting off most of the time and on a cloudy 90 degree day have the engine shutting off at every stop light.

Qualifier: This is how "my" 2019 'Nox operates, where "I" live, and how "I" understand the system to operate. YMMV

2019 Equinox Premier 2.0t, purchased 8/17/19, build date 6/11/19Irridescent Pearl, black leather
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post #13 of 15 (permalink) Old 02-04-2020, 06:32 PM
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Quote:
Originally Posted by Alan47717 View Post
Quote:
Originally Posted by Colt Hero View Post
As kowal_joe mentioned, keep an eye on your A/C usage and STOP/START “working/not working”. I don’t have this feature on any of my vehicles, and I’m gonna try to avoid it with my next new vehicle purchase, but I’m pretty sure I’ve read here that use of A/C deactivates STOP/START.

You may have had a battery issue, but your use of A/C may have also been disabling STOP/START. Two “issues” at the same time...
A/C operation doesn't deactivate the stop/start system. The system takes into account cabin temperature, sun load on the dash sensor, fan speed, outside temperature, etc. to determine whether or not to shut the engine off or not. My 2019 2.0t follows roughly the following (climate control in auto for all conditions):

1. 95+ degrees - never shuts off
2. 80 to 95 degrees & bright sun - shuts off rarely
3. 80 to 95 degrees & low sun/clouds - shuts off frequently & restarts within 35 to 40 seconds

Below 80 degrees (and remember, these are approximate temp levels) the system activation is strictly potluck. In Tucson we can have bright sun on a 60 degree day that will keep the engine from shutting off most of the time and on a cloudy 90 degree day have the engine shutting off at every stop light.

Qualifier: This is how "my" 2019 'Nox operates, where "I" live, and how "I" understand the system to operate. YMMV
But how does the A/C couple to the engine on these vehicles? Is it the conventional way - a pulley and a belt? If so, and you shut the engine OFF, wouldn’t that kill your A/C? Or is there a separate electric motor that kicks in to keep the A/C running? I thought I remembered reading the coolant works that way?

2011 Equinox 1LT (dlvd. Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 142k miles [01-FEB-2020]

2002 Impala 1LT (dlvd. Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /228k miles [01-FEB-2020]
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post #14 of 15 (permalink) Old 02-04-2020, 07:13 PM
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Quote:
Originally Posted by Colt Hero View Post
But how does the A/C couple to the engine on these vehicles? Is it the conventional way - a pulley and a belt? If so, and you shut the engine OFF, wouldn’t that kill your A/C? Or is there a separate electric motor that kicks in to keep the A/C running? I thought I remembered reading the coolant works that way?
To the best of my knowledge, the A/C is conventional.

My experience with stop/start is that if the A/C is on, the engine will restart while stopped at, for instance, a traffic signal long enough that the cabin starts to warm back up. I don't know the threshold parameters of the stop/start system that it uses to determine when to restart while stopped, but I have found the cabin temperature rise to be minimally noticable even during the blisting hot days in late summer here in SoCal. It doesn't get unbearable eveb during the monsoonal flow that the "Zonies" send our way.

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post #15 of 15 (permalink) Old 02-04-2020, 07:27 PM
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one other possibility is a dying battery will prevent the auto start/stop ...on the diesel we have it does not operate if the voltage is below 12.6 or 12.8 V ....if the battery is dying or the alternator is not providing enough charge..it will never cross that limit.


I'll bet a dying battery...as many on this site have complained of failed battery within 6 months to a year after taking possession of their new car.

2018 equinox 1.6l Diesel LT, Hecho en Mexico, julio 2017
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