First question back is "Why do you need to?" Normally you would just remove the nuts to undo the neck that the thermostat sits behind. If you really do need to remove the studs ... First, put some penetrating oil on the studs. Give it some time to soak in and do it's stuff. Next, I would lock onto the stud with a pair of vice grips. They are screwed in, and should screw out. DO NOT TWIST THE STUD - ROTATE IT ONLY. If you twist you are in danger of breaking it off. If you do that you get to drill it and then use an extractor (also called an "easy out" - nice name, but not always easy). Of course, you can take it in to a machine shop and let them do it! If you want to save the studs screw 2 nuts together at the top of the stud and tighten them together, then put your wrench on the bottom nut and the stud should come out. If the nuts move tighten them until the flat sides are matched and use a deep socket over both nuts to remove it.
Follow the upper radiator hose from the radiator to the engine. Where it goes into the engine, there will be 2 bolts. These bolts are on the thermostat housing. Remove the upper radiator hose from the housing. Then remove both bolts, and pull out the housing, your thermostat will be in there. It sits freely in the housing, so it might fall out. (You may have to remove 2 nuts that hold the dipstick on to get to the bolts. The nuts are right on the bolts themselves)
Follow the upper radiator hose from the radiator to the top of the engine. There will be 2 bolts once you have drained the radiator you can remove these bolts that hold the waterneck housing down lift it up, and there will be the thermostat. Follow the upper radiator hose from the radiator to the top of the engine. There will be 2 bolts once you have drained the radiator you can remove these bolts that hold the waterneck housing down lift it up, and there will be the thermostat.
Partially drain the radiator into a container. Remove the upper hose at the engine end. Remove the 2 bolts that hold the thermostat housing and remove the thermostat. Clean both surfaces and install the thermostat, install the housing and the 2 retaining bolts. install the upper radiator hose and top off the coolant. It is located at the engine end of the top radiator hose in the thermostat housing.
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