Thank you sir!

Yes, A/C was on full but the lowest set temp was the same as the outside air temp.
Not much I could do. Headlights on, stereo on, stuff plugged in to 12V ports.
No rear defrost.

If you think it’s a good idea I can do it again on a warmer day.

 

Hard for me to wrap my head around that... we've NEEDED A/C for over a month now.

Probably worth another run when you REALLY need A/C.

 

There was a heat wave here for the last 3 days with temps in the 90's mid afternoon.
Today the heat broke and a cold front came through just in time for me to do the test.
Cold wont be around long. Supposed to be over 80 again tomorrow afternoon.

 

I am so jelly.



These are our "feels like" temps.

 

seems like the first good testing older pack.

just for reference in city traffic flat ground my yukon seems to charge to 62-63% at most, on highway for a while it seems to target about 55% soc.

only time I see anywhere near 70% soc is popping the hood and letting it run and even then about 68% is all it wants to do, that last 2% takes a very long time. it just doesn't put charge current into it.

with the ac pulling 8-12amps depending on outside Temps, just under a 100 here regularly. it will go down to 43% before starting the engine, go up to 46% go back into auto stop and repeat.

I don't know if it's really good for it, but if I know I'm going to be parked for 20mins or more, I just pop the hood to let it idle. the ac works better too, watching the compressor rpm on the tech 2 it is higher with the engine running and higher driving. once in auto stop the compressor rpm slows down and you can tell a little bit in vent temp. probably something gm programmed in.
​​

 

If your battery is in decent shape, it's ultimately less stressful overall to simply sit there and allow the battery to cycle in the 3-4% range it wants. If you have a strong preference for what you're doing, the only real downside is the potential for more heat into the battery due to the charging at higher SoC.

 

Not for me but I expect you get used to it.
I'd send a pic of our forecast but its in Celcius.
Right now its 17 so about 63 F,
It was 16 when I got home last night. Supposed to hit 27 this afternoon.

 

That's what you tell yourself, but after 27 years, I'm starting to not believe me.

I've got some °C to °F targets memorized, and my off-grid system's battery reports in °C, so I'm semi-fluent for a colonist. My favorite is 22°C.

While we live in the Phoenix area, we've got some high desert land at 6500'/1980m, and even this time of year we see 16-32°C daily ranges. Just a couple weeks back, we had a heat wave where highs were over 38°C. The best thing about it is it's truly a dry heat, and there is no heat-islanding since it's very rural. As soon as the sun sets temperatures plummet.

27°C is pretty marginal for putting a steady load on the A/C. I'd wait for 32 if you can get there.

 

The truck has been running great from January 2025 when I first created this thread to today May 2 2026. I daily drive it with lots of highway and stop and do city traffic. Today i drove a few blocks this morning, then later this morning moved it out of the driveway....couple of hours later nothing. completely dead again. No idea what fixed it the last time.
I charged the 12V but not out of the car with no change.
Now that I have gone through this thread I'm going to try unlocking the door with the key(cant hurt its all i did last time) and I'll charge the 12V out of the truck.
If anyone has any other suggestions I'm all ears.

i will add that i have dash light and headlights etc after charging the 12V just no start

Code P1A0C shows some interesting info when I search it.
That's one of the codes I get as well as...
P0562
C12E1
P0C76
C0899C0561-71