Head gasket going out?

Hello, no, I don't see concerns with head gaskets for this 4.0L V6 SOHC engine. Assuming it's the SOHC engine and not the OHV engine. Either way, not much going on as far as head gaskets here. As far as overheating - you'll need to drill down to the root cause to find out why it's happening. Is the cooling fan working at the radiator, for example? It's too hard to know what's going on without performing a hands on assessment. When the thermostat was replaced, was all the air purged from the cooling system properly? Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops