Strange Noise

[bluebeast1562]

Not sure if this has been addressed but as the temps have gone up, I use the max A/C in the Ram. When I park, shut down, wait a few seconds, I hear a type of whistle coming from under the hood. Not sure if it is pressure release from the A/C system. Just figured I would ask here.
Thanks

 

[Sherman Bird]

Yup! Refrigerant pressures equalizing between low and high sides!