Does it stop when the blower motor is turned off? Or does it stop when the vehicle is not moving?
Normally this type of noise is an HVAC housing door that is not sealing causing a hissing noise.
Can you get a recording of the noise which will help identify it?
Let us know about the questions above and we can go from there. Thanks
Thursday, July 9th, 2020 AT 4:07 PM