2001 jeep grand cherokee is overheating, water pump, radiator and thermostat new

I'm pretty sure we purged the system. And it immediately starts to overheat as soon as we turn it on.

When you say overheat, what is happening? Coolant is boiling over out of the coolant reservoir? Are you saying it does this with a cold engine also? I would be looking to see if the coolant is circulating properly or if there is some kind of blockage.The radiator could have debris built up on it preventing air flow from cooling the coolant. Is the fan working as it should?

Yeah the fans working fine. And the coolant is boiling in the reservoir. And as soon as the engine cuts on the temperature skyrockets.