Where is thermostat? Need to replace.
Follow your top radiator hose to the engine. Right where it attaches to the engine should be the thermostat housing. Kinda looks like a golf ball with a pipe coming off it. Any way, the thermostat is in that silver golf ball housing. If you plan on changing it out, you will have to drain some fluid out of the radiator. Otherwise you will have fluid all over you and the engine. Just remove the two or three bolts that hold the housing to the engine block. The thermostat is underneath. Here is a pic.
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