2003 Mercury Sable Q&A
2003 Mercury Sable Question: Bird Chirp noise coming from serpentine belt side of car below 1000 rpm.
Bird Chirp noise coming from serpentine belt side of car below 1000 rpm, after acceleration, noise can't be heard. Every time car is operated. - Visitor
The belt may need a tension adjustment, the belt may need replaced, or possibly a belt-driven accessory is starting to fail. Have a shop check it out for you. - Tyreguy
Also a cam shaft position sensor will make the bird chirping sound as well....Had one to do it and sometimes it sounded like it was the front of the motor sometimes the rear and sometimes sounded like it was coming from under the intake,come to find out after further diagnostic testing it was the Cam Shaft Position sensor who was the dirty bird. - littlefreddie1