what makes my 2008 dodger charger run hot?

Hello, completely impossible to know what's going on without assessing cooling system operation first hand. But, what I will say is that if the problem only started after the timing belt replacement, then there must be some kind of link. I'd suggest some hands on diagnostic testing in relation to the tear down and reassembly for that repair. It's all guesswork until you start hands on evaluation. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops