2000 lincoln navigator blows white smoke ,but runs and drives fine

sounds like a head gasket.. running rough from loss of compression in one cylinder and it's burning antifreeze causing the white smoke

Worse case this could be due to a blown head gasket - however let not jump to conclusions. Where is the oil coming from and did you have it changed recently? Water is common from the A/C condenser and or over fill of the wiper fluid or possibly rain / bad oil change place that "rinses the engine" with water to get excess oil off. If you did have your oil changed / car serviced, take it back and have them check it. Maybe it's a loose oil filter or loose oil drain plug / bad washer on the drain plug. If you haven't have the oil changed recently, did you hit anything or did the car over heat recently? To see if you blew a gasket, check your overflow tank coming off the radiator. Pop the cap and look inside to see if you see oil (not dirty water / coolant). Also check if the car is blowing blueish smoke or excessive white smoke when you drive / rev the motor. If not, hopefully your fine. Post more details and you'll get a better answer. Good luck!

head gasket would cause over heating and possible white smoke, your problem sound like the m.a.f. sensor needs replaced

possible blower motor

you might check your valve seals if it does this moreso when its colder

Hello white smoke is usually engine antifreeze,Blue smoke oil burning,Black smoke car running to rich on gas,gas is not burning properly.

sounds like the leakages that operate the flapper are misaligned or bent. if its electrically operated then actuator could be going bad

Sounds to me like a leaking heater core, probably just started. Quite an extensive operation to replace. If you happen to be in a cold climate, the windows will undoubtedly fog up. Hope this helps

Idle Air Control (IAC) motor is sticking.You can try taking it off and cleaning it but most likely will have to replace it.

There are level control sensors they look like little arms (with joints like your elbows) mountesd on lower control arms. They may be at fault they control the height and turn the pump off when the height is reached. try adjust height first before you replace, they can be adjusted. Good Luck