So hear is the weird thing......this past weekend we got a pop up message on the console something like “caution steering assist is reduced drive with caution” And the AC quit working. Car drove fine except for the messagand no AC. Drove around Sunday with intention of taking car back into dealer Monday morning. We then realized the annoying Drone was gone!!!!!! Great except for no Ac and weird message...
Well...... Monday morning and message was gone and AC was working again and still no drone!!!!! So far...
Beginning to believe that this might be computer related. There was something about the Buick enclaves that had a cable that leaked signals across the wires and caused all sorts of weirdness. Maybe a loose connection or something.
Please let me know if you find anything as this is too weird.
Weird to us, maybe not to the programming in the ECU.
Drone sounds like it is engine exhaust noise when it is placed under heavy load......the noise is normal, although maybe not when at such a high level. "Load" is not only the weight of passenger load but the parasitic load of accessories on the engine itself, i.e. load of the high amperage alternator output when feeding the huge AGM battery, the electric motor on the steering rack (no power steering pump) and HVAC motors; and the A/C compressor.
Just a guess
That weird message related to reduced steering and inoperative A/C might be the ECU's effort to reduce mechanical loading on the engine itself which will indirectly affect engine noise at the resonance point.......sort of like the message: "battery low, start engine" you sometimes get when playing the radio with the engine off, even though there is still plenty of reserve in the battery. The caution regarding steering assist loss may be the ECU's effort to cut power to the steering motor and A/C clutch and HVAC motors to reduce engine loading. Might want to check the tightness of the connections on the battery and the crap load of fusible links coming off the battery. A loose connection could be placing an abnormally heavy draw on the alternator.