Re: 2001 Ford Focus chirp or squeal?!
Run a good quality belt and make sure the pulley's are all properly aligned. A dealer I used to go too replaced my idler in an old sedan that I owned and never aligned the pulley's properly causing the belt to slip. Get another option from another shop. There are listening devices (any reputable shop should have one) that can pin point most sounds.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!