Bleeding Air from a Lincoln LS Cooling System

1. Park level; engine cold.
2. Remove coolant reservoir cap.
3. Start engine; set heater to MAX heat, blower on high.
4. As thermostat opens (~90 °C), bubbles rise in reservoir.
5. Top up with 50/50 coolant until bubbles cease and level stabilizes.
6. Replace cap; let engine reach full temp; check for heat from vents.
7. Cool down; recheck reservoir to “MAX” line.

Some LS models have a bleed screw on the thermostat housing—crack it open until steady coolant flows.