3,850 on the odometer and today I hear this loud hissing noise coming from the rear of the car. Sounded like I was dragging something or the sound of air rushing out of an air hose. The sound starts up at about 50 mph and stops at 15-20 mph. Did not find anything caught in the tires....could this be coming from the engine? Taking it in on Tuesday. Any thoughts?

 

Coolant reservoir cap locked down?

 

Metal, I visually checked the engine but did not think to see if it was loose. I will try that in the morning and give an update. Thanks.

 

Metalsolid,
The cap is locked down. Guess I will find out Tuesday.