RC 350 parked in garage, 40 deg, F, for 4 hours. Happened to walk by and heard noise. Sounded like a quiet, harsh electrical hum are air escaping, Not positive but it seemed like the source was at the rear of the car and not the garage door. Noise stopped before I could trace it further. This was a second occurrence. So far no dead battery or flat tires! Sound familiar to anyone?

 

That's gotta be it.
Thanks much, now I don't have to sleep out in the garage. I love the car but I won't sleep with it!

 

be glad you don't have a hybrid.


for 4-5 minutes after parking the Brake accumulator/reservoir releasing pressure clicks and whirrs.


I can hear it in my house 40 feet way with doors and windows closed.