2003 lincoln aviator/how do you know if there's motor damage

most often refill tires to spec (35psi) make sure all tires are same pressure then must drive at 40mph or faster til light or chime goes off

Wow, that's a weird one. Run flat tires?

Time to correctly inflate the tires and bring the oil level to required level.

Your done

Sounds like a bad head gasket

The white smoke is coolant in the exhaust

could be the water pump but try changing the thermostat first and see if this stops it from overheating.

Tire pressure ?

U must crawl under the front bumper, the lights come out from the rear.

http://i253.photobucket.com/albums/hh43/chuck943/N0003875.gif

Here is a pic of what it looks like
Remove the cover in the center of valve covers.
Remove coil packs
Remove spark plugs

Hate to burst ya'll bubble but I just got my 2003 lincoln aviator back after I had a front end accident took it in to have the oil changed and check for a transmission service also wanted them to check for a front end noise. Well go figure apparently its in the front differnential in something called the "vista clutch" anway it requires a new transfer case to be purchased. Apparently it runs about $2000 with labor included. Go figure the insurance company wont pay for it after already dumping $8000 in damages already to fix and stated they would not total my truck with 83000 miles on it. Well all I can say is i was told they only go out if they are burnt out from locking the wheels up and skidding and just 1 in a 1000 goes out so I guess we are just he lucky ones. Good luck hope this helps a little also make sure ther is nothing wrong with the gears cause it could create an even bigger problem.. Peace out!