Locating the Thermostat on a 2004 Lincoln Aviator
- Open the hood.
- Locate the engine (front, under a plastic/metal cover).
- Remove the engine cover (loosen bolts/latches).
- The thermostat is on the side of the engine block, near the top.
- It's a small cylinder with two hoses (radiator and engine).
- Loosen bolts (one or two) to remove.
- Pull out carefully to avoid coolant spill.
- Inspect for damage or clogging; replace if needed.
- Install new thermostat, tighten bolts.
- Replace engine cover.
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