If the rear audio controller is disconnected, would that make the rear speakers not work?

Happens when moving from about 5mph to 40 mph diff / driveshaft makes loud moaning noise

My 2002 5.3l flex ls 4x4 suburban some times stalls at low idle and upon start up if I turn on the heater it dies

Will I also need an alignment

Just did an oil change on my Suburban and noticed a white, milky substance on the inside of my oil fill cap. What is that? Engine has 201K miles.

I am having it flushed and ac filled at a shop.

My question is should I put on the ac belt now or after the refil?

The brakes build pressure as I drive and won't release. They get hot. If I lift the pedal with my toe it will release and then as I drive it builds up again the pedal also gets hard, very little play.
I have replaced the rotors, pads, brake lines, master cylinder, and vacuum booster. I have bled the lines several times. I don't have any ABS codes when checked with a code reader. What can it be?

I replaced the trans case acuator motor. After replacing, it gives me the service 4wd code. i had the code checked and it told me low voltage. i checked the votage to the acuator and it reads 6.5 to 9 volts. All the wiring looks good. I traced it back to the main loom but no farther.

Will go down and up but stops before closing about an inch from the top.

I start the car but it does not move, nor makes any nose at all. I was going to try to see if it is a fuse but I am not sure which fuse it is. Can anyone let me know which fuse is it, and if it is located in the fuse box inside the car, or the one next to the engine?

If it is not the fuse, what else could it be? The motor or switch?

I lost my owners manual. Illustrations would be greatly appreciated. Thank you.

Drive shaft broke while wheels were spinning on ice. It fell out from underneath car.

sometimes it show correctly but most of the time it show empty with the need fuel light on. the car has 149,000 miles on it and the fuel pump was replaced at 130,000 miles