Does it when it starts and doesn't stop it is a 2000 mazda mpv 2.5? 6 cyl 24 valve
SOURCE: Mazda MPV V6 engine noise
My strong guess without looking at it would be a cracked exhaust manifold, when it gets hot the metal expands an it doesn't leak.
SOURCE: when engine fan engages makes loud squealing noise
OK, the motor that you are referring to has lots of cooper windings and internal parts that can become misaligned during long term operations and extreme heat situations. this noise you are hearing is basically a warning sign that is trying to tell you that this motor is failing and will go out soon.
SOURCE: 1995 Mazda MPV Noise
if it's a knocking sound it could be worn internal compnents ie. rod bearings. if it's a ticking sound the valves may need adjustment.
either way a mechanic will have to hear the sound to properly identify it.
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