My Grand Vitara car rises the temperature

Friends of the forum would appreciate your help with the following consultation.
I have my Grand Vitara 2002 car with 240000 km of travel and a couple of week ago I started having problems with the temperature of my car. I took it to the mechanic and oil was observed in the radiator with what the mechanic told me that the packaging had blown and that it had to be changed.

It is already under the machine and the engine was repaired, the packaging, the water pump, wheels, plates to the radiator was changed but the car continues with the problem, the thermostat does not open and has already been tested with a nuveo thermostat and continues the problem that the temperature rises. What can it be?

The problem is not solved by simply by changing the packaging, the thermostat can have broken and if it is too heated, the cylinder head plane has been combined, which does not say if in the repair it is rectified this, there is also the possibility that the fan does not work correctly (because the temperature or bulb sensor is wrong, or radiator electrovalve, or reliant, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse, fuse,