BE–109 BODY ELECTRICAL SYSTEM – AUDIO SYSTEM 31 | Noise | NOISE PRODUCED WHEN ENGINE STARTS Whistling noise which becomes high–pitched when accelerator strongly depressed, disap- pears shortly after engine stops. Yes — Alternator noise. No Whining noise occurs when A/C is operating. Yes — A/C noise. No Scratching noise occurs during sudden accelera- tion, driving on rough roads or when ignition switch is turned on. Yes — Fuel gauge noise. No Clicking sound heard when horn button is pressed, then released. Whirring/grating sound when pushed continuously. Yes — Horn noise. No Murmuring sound, stops when engine stops. Yes — Ignition noise. No Tick–tock noise, occurs in co–ordination with blinking of flasher. Yes — Turn signal noise. No Noise occurs during window washer operation. Yes — Washer noise. No Scratching noise occurs while engine is running, continues a while even after engine stops. Yes — Engine coolant temp. gauge noise. No Scraping noise in time with wiper beat. Yes — Wiper noise. No Other type of noise.