Everytime I start my car a loud noise come on too, from under the hood, what is it?
If it is a rattling sound the starter may be loose, the starter bendix gear might be damaged.
If it sounds like a fan, it is likely the cooling fan.
If it is squealing, it is the serpentine belt. The idlers may be worn, their bearings may be dry- they make a chirping sound at slower speeds when they are dried out. Replacement is the best option.
Air pumps can sometimes make a thumping sound, and if certain emissions valving rusts through, it can be outright exhaust noise.
If it is a high pitch whine, that is usually the alternator. It is not a good sign when they begin to whine. Alternator bearings can also fail, and the sound varies.
Water pumps and fan clutches can also fail and they tend to make softer sounds. These can be checked by checking for radial play in each item with and without serpentine belt tension applied.
Testimonial: "It seem more of squealing then when ran a little after I let it warm up it goes away until the next morning or when ever I let the car sit. It will intend to start again until I have ran the car where ever I had to go. "
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