How do you replace a engine in a 2003 Lincoln navigator? Is it true that you need to lift the body of the car and place the body over the engine?

Lincoln nav.
well is the engine the same size ?
it sold new with 1 of 3 engines
4.6 and 5.4, 2v and 4v. 4v is DOHC twincam head
so is 3 unique engines there, day 1. new.
so of both cars have same engine ,
and the parts counter told me it is same on 5.4L
so did rockauto.com,
if still OEM stock that is, some 3rd party sold parts might say different.
vast those.

Look at the existing bulbs.

HID bulbs are a a different shape and have a high voltage ballast because the are a high voltage arc lamp.

https://www.amazon.com/XtremeVision-2003-2004-Lincoln-Navigator-Replacement/dp/B01DQ1TYHY

As opposed to a standard halogen bulb that has a filament.

https://www.autozone.com/collision-body-parts-and-hardware/headlight/lincoln/navigator/2004

The light from HID is much brighter and often brilliant white or blue-white.

google 2003 Lincoln navigator manual
took less than 3 seconds

https://www.lincoln.com/support/vehicle/Navigator/2003/owner-manuals/

No. For some engine work, it is easier & less time consuming to raise the body off the chassis. But for a coolant leak, it shouldn't be necessary. First you need to pinpoint where the leak is. Borrow or rent a pressure tester from advance or AZ to check for the leak. These vehicles are bad for the heater hose & fittings leaking on the passenger side of the engine near the firewall. Some special tools are needed to release the hose from the heater core tubes. Another common problem is the intake gaskets, but you should be able to see that with a mirror & flashlight.

Your not doing that at home in the driveway

Dangerous job & way too heavy without a lift
& proper equipment

if the issue is just with the one mirror, it probably needs the mirror replaced. check for power and ground to the mirror, if they are good, you better look for a new mirror. get ready for the price though, and if your mirror is body colored, it will need to be painted too.

Check air filter if it's dirty replace, replace fuel filter. these are the most neglected things on a car. If you need more help let me kow.
Randy

did lift gate get repaired ? warranty ? what was replaced? $ cost to customer?

Check your codes, you might get an EGR code, Fords are notorius for bad breathing,
clean your throttle body also

Hi there...
well usually this happens, when the valve in the dash-board is defective. you can't replace it your self. its not costly, but the mechanic needs to dig in deep to reach it in most cars. i don't know where exactly it is loacated in the Navigator. but dont listen to any body telling to replace anything but this small in dash valve .

good luck i wish this helps u in anyway.
have a nice day