Oddly, it doesn't always make noise. In fact I have noticed either on hot days or on longer drives it makes noise

Is it dangerous to drive like this? ie, can I lean out and ping? Or is it just a complete failure and I will stall?

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010