Where is the location of the thermostat in the 2005 on 2005 Lincoln Aviator

Believe I actual know the location but is it as difficult to remove as it appears?

Asked by for the 2005 Lincoln Aviator
It should take an experienced technician about 1/2 hour to replace the thermostat on your 2005 Lincoln Aviator. That labor time would suggest replacement is not to difficult.
do u have to drain the whole system?