A/C system whistle?

JASONHARRISON903

MEMBER
2017 RAM 2500
6.7L
6 CYL
4WD
AUTOMATIC
110,000 MILES

When operating the vehicle at highway speeds, I have an annoying whistle while the recirc button is active. When I turn recirculate off, the whistle goes away. Am I looking at pulling the dash to replace the actuator, or is there something simpler that I can try?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

A whistling noise can be tough, it can be caused by a piece of insulation that is now missing, I would try the blend door actuator which will be the easiest fix, here is the location so you can check it out or replace the actuator. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

Images (Click to make bigger)