Usually that noise is caused by a slipping serpentine belt. When you first start, the alternator is creating a lot of extra electrical power to recharge the battery. During that time the alternator is more difficult to turn and if the belt is even slightly loose or the tensioner is marginal, it will make that terrible noise.
A slipping drive belt is one possibility.
There are two probable causes. Assuming you are talking about a car fan, the screeching can come from a mis-alignment of the fan withing the cowl or shroud that conducts air to and from the fan. If you are talking about a home HVAC unit, the screeching probably comes from a slipping drive belt (or a tired hamster).
a screeching noise
either your belt(s) or brakes most likely
why does my starter make a loud screeching noise when i start it?
A Ford Mustang Shelby GT is a sports car you can drive on the road. It has a loud noise and can only take 2 people and can drive very fast.
Eagles make a screeching noise
Fruit bats.
A Ford Mustang Shelby GT is a sports car you can drive on the road. It has a loud noise and can only take 2 people and can drive very fast.
good chance the fan belt is slipping when driving may need tightning up this wouold cause a screeching noise.
THE problem was the fan just in front of the radiator the bearing in it was seized I solved this by puuting some grease on it!!
fan clutch