Wife (no pics) drives a 2016 Yukon - Roughly 60k miles. 5.3L two wheel drive
tried to save money (read: use E85 gas) about 1.5 months ago - didn't go well. Colder temperatures meant lots of cranking before it would start. Shortly thereafter, battery sounded weak. Most of her driving is back and forth to school with kids (.2 of a mile) and to the grocery (1.5 miles). I put a charger on the battery and it was working fine.
Last week when it warmed up, she calls to tell me the AC is not blowing cold. busy with work, I ignore it.
Went to start the vehicle on Saturday to move it from the garage for some home projects and it barely started - battery. Charged it again. Back to normal.
When running, the battery gauge is sitting dead in the middle. It idles fine. Runs fine. No check engine lights.
If the battery is bad, why does it accept a charge from a stand alone charger? If alternator is working, why is battery gauge seemingly "normal"? Why would any of this affect the AC?
is it possible I have something else going on that could affect all of this at one time? Modern engines with the electronic shit confuses me. I generally understand concepts based on long forgotten knowledge of regular motors.
Wife is convinced it is all related to the E85 fuel. I disagree.