Q: With no pattern my 206 intermittently whistles LOUDLY! Touching clutch makes him stop. But then he PEEPS back at me and begins whilsting for no reason! Happens in all gears, mostly when at constant speed. Garage cannot find fault!? Driving me insane! Outside car its incredibly loud (& embarrassing!). To add more info.. At a constant 1200revs the noise kicks in and is at its loudest and steadiest. Above this, also constant. Originates from what sounds like at the back of the engine, under bonnet (obviously!).
A: When you touch the clutch, the "release bearing" pushes against the clutch spring. It could be this spinning bearing that is still in contact with the 12 or 15 "splines" of the spring. This could be making a high noise like a whistle or more like a "tuning fork". I think you need to adjust the clutch so the release bearing moves farther away from the spring when it isn't needed to disengage the clutch. I will try to find a photo of the spring splines, the things I believe are vibrating against the bearing. give me time.... OK EDITED NEXT DAY.... I have a new idea.. The 206 has an exhaust pipe with a connection at the back of the engine. Just below the steering rack and rods. I'm guessing that while driving, you have a greater pressure of exhaust gasses and the whilstling is caused by high pressure gas forced out a tiny crack in the metal. A true whistle. When you put in the clutch, the load is lessened on the engine, and the gas pressure is lessened. At the garage, when the car is just idling, and the mechanics are standing around...just looking.. again, the exhaust gas pressure is too low to produce this whistling crack phenomenon. So the mechanics don't hear it , unless they would drive the car HARD. Start by lifting the front wheels OFF the ground, and "driving your car" in the driveway of your home. (Jackstands!! a must)A friend can lie next to the car and look underneath at the exhaust pipe connections, while you "drive" and accelerate. Until the pipe becomes HOT in 90 seconds, he can even touch the pipe and run fingers along its surface.