fidelis_1

My 2014 Spark is making this odd moaning sound, but not during breaking or turning.  It doesn't seem to be coming from the engine but somewhere underneath the car.  It doesn't do it very often, but maybe 1 time during my daily commute (an hour). It's not very loud, sorry of like pressure is being released.  It tends to happen while sitting at a red light.  Any thoughts?