Squealing is most common with loose or worn belts, I would start by replacing the drive belt on the front of the motor and go from there, Its easier to troubleshoot a squealing motor if you know that the belt or belts are good.
SOURCE: on a 2003 mitsubishi montero sport w/ 3.0 v6 a/c belt squeals
Your belt is loose (and it just needs tightening) or it is worn and needs to be replaced. It may look ok but they glaze over; all the little ridges get shinny and slip.
SOURCE: thermostat montero sport?
It should be found at the bottom hose that goes to the bottom of the radiator and located towards the engine block. You should be able to see a plug and wires coming out of it.
SOURCE: My 2000 montero sport has little or no power when driving up hill
First thing I'd do is replace the fuel filter. If the car runs fine on level ground or downhill but struggles uphill, it's usually because a clogged filter isn't allowing enough fuel through to satisfy the engine's demand for enough to keep you at speed going uphill. Try that out - it's an inexpensive part and is usually the cause of your symptoms.
SOURCE: Exhaust leak/problem
I've had three exhaust manifolds crack on my 1999 Montero Sport. It's relatively common from what I've told and have read. Check to make sure you don't have a cracked manifold by removing the heat shield on each side (cold engine) then check the castings.
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