First you must inspect the cooling system of your car. It is not limited to radiator, you must check A to Z.
Like first you check the condition of water, is it full of rust? means its chocked and need a service. If internally it is good then see the outside fins usually they block with dust. Open the raditor cap, start the engine give some race and see if water circulate inside raditor, if it does not circulate the problem is with water body. Even sometimes waterbody needs a service when it is full of rust / dirt or if gets week need to be replaced. Also note if water in radiator gives you bubbles or jumps out while you little race the engine, that's shows whether your gas kit blown or not.
After that make your FAN speed is good and working perfect. The very important point is here, usually our mechanics do not aware about that. if your fan bracket is not well fitted or fan is sucking air from asides instead of fins of raditor then it would definite heatup your car. The fan should not suck air other than fins, this should be corrected.
Also never full your side bottles, the level should ba maintained as per given marks on bottle.
Another important thing is to check the radiator cap, check if rubber is hard then replace it immediately with a kabli one. The rubber washer of radiator cap should be soft and mold able else this would heath up your engine.
The careful check of cooling system may resolve your heatup issues.