Typically, a loud squeal on a cold start could be belt related. As belts age, the rubber becomes harder and glazes a bit. This can cause a brief, or constant, squealing. Also, belt tension can cause squealing as well. If the belts are stretched or the belt tensioner has weakened with age, they will loosen and squeal. Squealing can come from more mechanical components as well. For example, if the water pump, power steering pump, or alternator had a bad bearing, this can also squeal. Have a certified technician inspect the vehicle to find the exact cause of the squealing on start up.
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