I drove all day and the A/C, fan, windows, etc all worked fine. I parked it for 15 min; then started the car back up and the A/C fan wouldn't turn on and the windows didn't work. I then shut the car off and and started it back up and everything worked fine. So strange. I just hope this isn't some weird computer issue or something.

Any input to this would be great.

Thanks!

** Meant to write ever instead of every

 

Check the battery connections and voltage. Strange things can happen when the battery is not connected properly or has low voltage.

 

+1 for checking connections and voltages....take a quick look at the grounds..both on the bat and top motor mount too. Also check that the bcm is dry, and plugs are in tight.

 

My 2003 R53 used to do that occasionally. Climate control wouldn't come on, or the radio would be missing letters on the display. Restarting the car always fixed it.

 

Computer hiccup. Sorta like Windows, sometimes you have to reboot...

 

My '04 did that a couple of times. I guessed that the canbus needed a re-boot.