i have a 98 jeep tj sport and i was wondering where the thermostat was and is it an easy fix. thanks.

Fairly easy fix. Look at the top of your radiator and follow the big hose to the engine. Where it attaches at the engine is the thermostat housing. It should also have a smaller heater hose and a temperature sensor attached to it. There are two bolts holding the housing on. For a cleaner job, drain a bit of coolant out of your radiator into a clean bucket from the drain underneath. I find it easier to work with by removing the temp sensor plug and both hoses from the housing and then the two bolts. Once the housing is off, the thermostat should fall right out. pay attention to the direction it is installed. clean off the old gasket and clean all debris out of the housing. install new gasket and thermostat. Tighten 2 bolts and reinstall hoses. Put coolant back in radiator, run engine and check for leaks.