I have a 1996 f350 and whenever I start the truck when it's cold after I let it run for 5 or so minutes it starts a 'ringing sound' coming from what appears to be the front of the engine, possible water pump? It only does it when it's cold below 40 degrees. I tried posting a video but it wouldn't let me. The truck has a new vacuum pump on it. Brand new. Any ideas?
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