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Just did this yesterday. It is quite a chore. Be sure to obtain the replacement rubber gasket / O ring before starting the dissassembly.
Remove the intake cover (it says Thunderbird V8) by gently pulling the push in pins out. They may break but replacements are available at your local hard ware store.
Loosen the clamps around the air intake tube where it joins to the engine and where it joins to the air filter housing. Unplug the two electrical connections on the front of the air tube. Remove air intake tubing.

Remove upper radiator hose by compressing the clamp. This is a very tight area requiring some work to get a pair of vise grips on the clamp. Don't despair.

Remove the three screws that hold the housing in place. Be gentle this is made of plastic.

Remove the thermostat and be sure to notice how it is in the housing. It must be in this position or the housing will not fit or worse yet could break when you tighten the nuts during reassembly.

Reverse process to reassemble.

While you have this all apart is a good time to replace radiator hoses and the serpentine belt.

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Q: How do you replace a thermostat on a 2003 Ford Thunderbird?
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