Radiator and thermostat have both been replaced.
A defective water pump can also cause overheating - the impellers on the pump wear and don't shove the water around the system. However, this is actually quite a rare occurrence.
Another cause of overheating is, unfortunately, a blown head gasket. Exhaust gases can find their way into the cooling/oil system via a defective gasket or warped cylinder head.
A quick check you can do is to check the oil on the dipstick. If the oil is a creamy/grey that's a sure sign of cylinder head gasket/cylinder head problems. You can also check your coolant for signs of oil contamination, though the creamy-grey oil on the dipstick is the usual indicator.
If you can, get a mechanic to do a compression test on the vehicle engine. A compression test will highlight any cylinder head problems.
If you do have a cylinder head /gasket problem driving the car will only make matters worse. Here in the UK a workshop will charge between 500 - 1000 pounds to overhaul/fix a cylinder head. It's not a cheap fix.
Get a mechanic to carry out a compression test first. If the cylinder head is beginning to develop problems, try a head-fix additive first. You simply add it to the radiator (not to the coolant bottle). Some of the modern sealants are quite good.
Most car spares shops will sell cylinder head sealant/additives. Or have a look on Ebay:
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xcylinder+head+sealant.TRS0&_nkw=cylinder+head+sealant&_sacat=0
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Testimonial: "thankd you my brother is a mechanic will let him know to check that"
Have a compression test done on each cylinder. Possibly a blown headgasket or cracked head
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