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1988 944 Turbo Fan and belt noise

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Vehicle Information: Model(924/944/968): 944 turbo; Year: 1988; Body Type: Coupe; Total Mileage: 83000;

So I think on the porsche 944 the fan has two speeds low and high..and it alternates in a pattern when hot right? not too sure..well i think i found the source of that squeeky belt noise..becuase it doesnt make it just driving around. but i noticed when i was at a stop sign i heard the "high speed" fan turn on and seconds later the high pitched noise started...i dropped underneath the car to hear where its coming from and its def. coming from underneath towards the front a little. Also, my car has always sounded like a truck engine but never noticed it..is that normal for an old car?..is it a sign of engine wear?

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