I've had a new raidator, thermostat, fan and water pump replaced in my 2000 Honda Passport but it's still over heating. What else could it be?

Could be several possible issues, was the thermostat install backwards/up side down?.. Did the tech check or flush the system?.. (mainly checking the flow through the engine block) was all the gaskets replaced and correctly installed?.. and was the gaskets actually the correct gaskets to begin with? Might even be the type of antifreeze you're using.

OK so turns out that the shop I went to that replaced the radiator forgot ti remove the temporary plastic cap off and that cap got lodged in one of the hoses. Once it was removed, no more over heating.