agreed with checking the consistency off the oil. if it is milky you will have a problem with the head gasket.

if not, then replace items in this order, thermostat - fan switch (if your fan is not coming on) - fan (again if the fan is not coming on) - radiator. you do not have to replace the radiator cap as is has an overflow tank.

also, when was the last time your water pump and timing belt was replaced. if you have more than 120k miles and have no idea when it was done last, it is a likely culprit.

i do timing belts/waterpumps for 225 and takes about 4 hours.