How do I replace thermostat? 1990 leSabre

I have an engine overheating problem. I don't think it's the fuel pump. I would like to try replacing the thermostat first but I'm not even sure how to get at it. Any help out there? It is a 1990 LeSabre 3.8 liter V6 4 door with A.C.

ok go to your top radiater hose at the end of that theres your goose neck witch is were thermostat.clean that real good where thermo is and neck. ok then refurse when putting it back togethere.make sure the car is cold or you get burned..good luck...

There will be one bolt on the top of the thermostat housing... I believe it will be an 11mm...

Make sure you have all of the O rings for the thermostat or you will have a leak... If the thermostat housing has never been off, you may be in for a treat as the intake and thermostat housing love to stick together due to corrosion..

Depending on where you are in this nation you may want to run the 195F or the 180F if you are in a hotter climate like Florida...

Good Luck

Check this site out , it will help you with changing the thermostat.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800b1c8c

Sure the coolant is at proper level. Can you explain the overheating problem possible someone can help diagnose further. I assume you mean't the water pump versus the fuel pump.

some those come with o,ring around thermo but yes theres a groove you need to clean when you take it off..

On the LN3 the Thermostats do not have an O-ring around them... Instead there is a thermostat housing to thermostat seal as well as an O-ring for the thermostat housing..

These O-rings have to be replaced...