OEM 2005 Lincoln LS Thermostat

2005 Lincoln LS Thermostat Parts Questions & Experts Answers

• Q: How to service the thermostat for the 3.9L engine on 2005 Lincoln LS?

  A: The servicing procedure for 3.9L engine thermostats starts with draining the cooling fluid and uninstalling the thermostat housing. An 18 mm (0.7 inch) open end wrench should be used to both compress the thermostat retainer and rotate it to take out the element. The thermostat can be freed from the housing through directional rotation. The service requires removing the thermostat spring together with the thermostat main spring and thermostat element. The thermostat pin should face the housing hole while you align it during thermostat installation. Place the thermostat with the small end of the thermostat spring directed to the housing. To install the new thermostat position it correctly while ensuring the retainer tabs engage the housing tabs. To complete the installation you should manipulate the thermostat by using an 18 mm (0.7 inch) open end wrench while pushing it down to rotate and fasten the retainer securely. Reinstall thermostat housing and complete the cooling system filling procedure followed by bleeding the system.