2001 Saab 9-5 Over Heating

I just replaced the water pump, cerpatine belt, timeing belt, and heater coil along with the fuel pump.

Now the car is agian over heating, and it seems to be coming from the front area of the engine (radiator area). With this model locating the raditor cap is difficult, so I have added fluid to the reserves. My question what is the promblem now. It is the radiator? Pleas ehlp