The thermostat is located at the end of the upper radiator hose. Here is a guide that will give you an idea of what you are in for when replacing the thermostat.
Drain the cooling system. Remove the thermostat housing to water pump. Remove the thermostat housing to water pump feed pipe. Finally, remove the t-stat. Reverse the process to replace.
Let me know if this help, or if you have other questions. Also, make sure you use the same type of coolant as is in the system. If it's Dexcool CHANGE IT!
Here is what it will be like in your engine I have feature both 4 and 6 cylinders. (Below)
Please let us know if you need anything else to get the problem fixed.
Images (Click to enlarge)
Thursday, November 16th, 2017 AT 2:56 PM