Hey, friends.
It's Len here from 1A Auto.
Today we have another 100K service for you.
This one's gonna be on a Gen 3 Ford Expedition.
Let's talk about it.
Now every 100,000 miles on these there's gonna be a big, old checklist of things that you're
gonna wanna go ahead and look at/service for your vehicle.
But specifically, at approximately 100,000 miles there's gonna be 2 things that need
to be done.
One would be the spark plugs which are typically gonna be iridium spark plugs and then secondly,
would be the coolant.
You'd wanna service and flush the coolant.
With that said, let's take a look under the hood.
Now the iridium spark plugs for this, there's gonna be eight of them.
There's gonna be four over on the passenger side bank and there's gonna be four over on
the driver side.
Typically, if you were to look along the top of the engine along the valve covers, you're
gonna be able to see some coils.
They're gonna have wires that go onto them like this.
Underneath those coils, if you were to unbolt them, of course, take the wiring off, you'll
find the spark plug.
What you wanna do is go ahead and take that out of there and you're gonna replace it.
If you happen to see a spark plug that looks like this when you go ahead and remove it,
well, then you know that that was very worn and you more than likely had some very bad
fuel economy.
Now speaking of the coils, I have one in my hand and no, it's not the one for this particular
vehicle but it is one that you can see.
If you see corrosion in there, well, you need to either clean it or replace the actual coil
itself.
And then of course, down on the lower area where your spark plug's supposed to go into
like this you wanna inspect this.
Make sure it's not cracked and dry rotted.
If it is, there's a possibility that your spark could escape and actually arc out against
the inside of your engine.
And of course, if you see any funny colors in there, well, then that's something that
you'd wanna service as well.
So now let's jump over to talking about the coolant because that's the second thing that's
actually gonna be due at 100,000 miles or every 100,000 miles on this particular vehicle.
Now just because it's only recommended to be replaced at 100,000 miles, that doesn't
only mean that you should only be checking at 100,000 miles.
Typically, I like to check at every other oil change or even approximately every oil
change at least to make sure that the level's good.
If this is nice and cool to the touch because you haven't been running your vehicle in a
while, you can press down, turn it counterclockwise and you should be able to remove the cap.
Typically, it's gonna be underneath a little bit of pressure so you wanna make sure you
open it up and away from your eyes, and at this point, you can kinda take a look at it.
You wanna gauge the color of it and everything like that and you also wanna test it to make
sure it's testing where it's supposed to be which would be approximately -32.
So that way there when it's super cold out in the wintertime it's gonna be where it's
supposed to be at.
But like I said, at 100,000 miles, that's approximately when you're supposed to be servicing
your coolant.
So essentially what I mean by that is you wanna flush the system.
You're gonna drain out as much coolant as you can.
Once you have as much out as you think you can get out, we're gonna refill it up.
Run the vehicle for a couple of minutes.
That way there the coolant can circulate in the system and then we're gonna redrain it
again.
Once that's drained out, we'll of course refill it.
We're gonna run it again and then we're gonna test it and we wanna make sure the test, like
I said before, approximately -32 degrees for the freeze point.
We can move along to the coolant reservoir right here.
That's something that you're gonna wanna make sure you get out all the coolant that's in
there and you wanna replace it with some brand-new coolant.
When you do that, you definitely don't wanna fill it all the way up to the cap because
that's overfull but if you were to look down along this area here, you'll be able to see
the lines where it should be at.
Get it to that point with some brand-new fresh coolant and you'll be doing all right.
You also wanna make sure that you check all of your coolant hoses.
You're gonna have an upper radiator hose, a lower radiator hose down on the bottom driver
side over there.
And then on the passenger side, you're gonna see some hoses that look like this and they
lead to the firewall.
Those are gonna lead to your heater core.
You need to make sure all these are in good condition, they're not cracked or dry rotted
in any way, and of course, they're not leaking.
One last thing talking about the cooling system is you wanna take a nice garden hose, come
from a distance and spray all inside here.
Right behind the grille is where your radiator's gonna be.
You wanna make sure you clean out all those fins so that way there your coolant system
can function properly.
Now since we're under the hood we might as well just continue under the hood.
Right?
So let's start on the driver side.
You have your master cylinder.
That's gonna be located on the driver side firewall of the vehicle.
Typically, that's gonna have DOT 3 brake fluid in it.
That's what you should have for this particular fluid.
And of course, it should be up approximately at that maximum line.
If you see it very low, check for leaks and double-check to make sure that your brake
pads aren't worn low.
Now moving along from the master cylinder, we're also gonna check our oil level.
You can see that the oil level is in between the two hatches which is very good.
I can also tell that this oil's pretty much ready to be serviced anyway.
That's not typically something that's due every 100,000 miles but you would wanna try
to keep up with that approximately every 3,000 to 5,000 miles.
And if you do need to add oil, over on the passenger side valve cover, you're gonna find
the fill.
It's a little cover here and it's also gonna tell you what type of oil to use which would
be 5W-20.
Let's continue on to checking your air filter.
There's gonna be a couple of clips along here and then, of course, you'll have a clamp right
there.
You need to loosen those so that way there we can lift off this cover.
If when looking at the air filter you can see that it looks as though it's a little
bit discolored, that's not really something that you necessarily need to worry about,
but if you look inside here and you happen to see that it has a lot of crud inside there
or buildup with leaves or anything like that, that's definitely something you're gonna wanna
service.
You also wanna check the bottom of the housing here.
If you see a whole bunch of debris or even some acorns, you know that there's a mouse
getting inside there and it's trying to build a home because it wants to keep warm.
And then one last thing with the air filter.
This area right along here is considered your mass airflow sensor.
This is what's gonna sense how much air's getting drawn into the engine.
So if this is dirty in any way, well, then it's not gonna be able to meter properly and
you're gonna notice low fuel economy.
Typically, this is something that you can easily clean by disconnecting it.
Remove the screws that hold it to there and then clean the sensing unit with the mass
airflow sensor cleaner.
We also wanna make sure we check our power steering fluid.
If you look right along here, you're gonna see the cap for your power steering fluid.
You could open this up, take a peek inside, and it should be like a nice, pinkish-red
fluid inside.
If it looks as though it's brown or discolored in any way, it's definitely something that
you're gonna wanna service/flush.
You also wanna double-check the level to make sure it's sitting in between the lines there,
it's not all the way down at the bottom and it's definitely not full all the way up to
the top.
Either way would be very bad.
If you were to look right along here, you're gonna find your battery.
You're gonna see your positive terminal covered up by something, typically.
And if you see any crusties that look like this, that's called corrosion.
That's gonna cause restriction, and of course, it's gonna help drain the battery faster than
what it should be.
So that's something that you definitely wanna service.
Looking at the top, you can kinda see that it looks like it has some sorta goo on it
that's been collecting a lot of debris from driving down the road.
If you were to take your multimeter and just kinda test on that stuff right there, we can
see that I actually have voltage that's just kinda going out there into the atmosphere
right now.
That's wasted voltage and it really doesn't make any sense to leave it like that.
So you'd wanna clean down the battery.
But when you're cleaning down the battery, you wanna pay special attention to these right
here.
These are vents.
If you end up getting any cleaning solution inside there, you could contaminate your battery
in which case it won't function properly.
So just be very careful when you clean that down.
In the center over the radiator, you're gonna find your fuse box.
Go ahead and take a peek inside there.
If it looks as though anything's got funny colors or somebody's been building a nest
in here, that's something that you're gonna wanna take care of ASAP.
This looks great.
Close it up.
Make sure it's sealed.
Now the last thing that we're gonna talk about under the hood is checking your serpentine
belt.
That's the belt that's gonna be running across all the pulleys along the front of your engine
and that's gonna include your alternator which, of course, is very important.
If the belt's in poor condition, maybe you look inside the grooves right along here and
you can see that it's dry rotted and cracked, maybe it has more than six cracks within an
inch.
Well, that's something that you definitely wanna replace.
Something else that you need to think about with the belt bell is while the vehicle's
off, you can grab onto that belt, give it a nice tug and you wanna check that serpentine
belt tensioner that's right down there.
It's gonna be a little bit hard to pull on it because the tensioner's doing its job but
as long as it functions and it retracts the way that it should, you're doing all right.
And if you need to service it, obviously, it's much easier to see from underneath the
front of the vehicle.
All right.
And of course, we're gonna make sure we check the lights.
So let's check some headlights.
Yep, those look good.
Some high beams.
And if we've got fog lights, of course, you wanna make sure that your fog lights work
along with your directionals.
And of course, while we're in here, let's go ahead and check those wiper blades.
Nice.
Of course, at any milestone service it only really makes sense to check your brakes.
Typically, you can do that straight through your wheels.
It'll kinda give you a good inclining of where the pads are at.
If they look as though they're worn low, well, then, of course, you're gonna wanna completely
take this apart and diagnose what's going on.
More than likely, if you do end up needing brake pads for this which at 100,000 miles
you've probably already replaced them a couple of times...if you do replace the pads, you
replace the rotors at the same time.
Something else that I would pay attention to is on the backside of this.
Typically, you're gonna be able to see the caliper and if it looks as though it's moist
at all in any way, it might be potentially brake fluid and that might be an inclining
on if you were having that low brake fluid that I was talking about earlier.
If you happen to see a brake fluid leak whether it's on the caliper or on one of the flex
hoses when you inspect it, well, then that's something that you need to replace/service.
We also wanna mention the front end because if your front end's loose in any way, it's
gonna affect the wear of your tires.
So what we wanna do is go ahead and put a jack underneath of your lower control arm
right here.
We wanna make sure it's in an area where it can't slide and that's gonna load your suspension.
At that point, we can check the ball joints and the tie rods.
Coming from the outside of the wheel, if you grab it at 12:00 and 6:00, try giving it a
shake up and down.
If you feel any movement, typically, that's either gonna be because of a wheel bearing
or even your upper or lower ball joints.
Grab the tire like this, 3:00 and 9:00.
Give it a little shake like this.
If you feel movement, well, then that means that you probably have an issue with either
the inner or the outer tie rod end which would be these located right here.
Also in the front of your vehicle, you're gonna have coil-over struts.
That's these right here.
Typically, the coils are gonna break either down along the bottom area or even up along
the top but you'll generally see it.
It'll be a big, old break and sometimes it'll even be a piece missing.
If you have an issue with the coil over the strut itself, generally, people are gonna
replace it as a complete unit and when you do it, you do it at the same time as the passenger
side as a pair.
You're also gonna wanna make sure you check your sway bar links.
If there is movement, then you should replace the link.
There's also a possibility that you could have an issue with your sway bar bushings.
If this is worn or stretched in any way and the bar can move up and down, every bump you
hit, clunk, clunk.
That's pretty typical.
Especially on vehicles with higher mileage.
We're also gonna wanna check that power steering rack which runs from side to side.
That's part of your steering and if you see fluid that looks like this, you're gonna wanna
get under that boot and make sure that the rack isn't leaking.
If it is, that means it's leaking out power steering fluid and if you're leaking power
steering fluid, there's a possibility that the system might not function the way that
it should.
Of course, we're gonna wanna check our axles.
You wanna check those boots and make sure they're not torn or worn in any way.
If it feels as though they're dry and brittle or you can see some cracking, it's something
that you're probably gonna wanna replace the whole axle itself.
Check all.
Of course, you're gonna have two on the driver side and two over on the passenger side.
Make sure that they're in good condition and continue on.
While you're under your vehicle, it's always important to make sure that you check for
any fluid leaks.
So check your differentials, check your oil pan, check your transmission pan, and of course,
all the way down the line.
If you see any fluid leaks, it's something that needs to be taken care of.
Now keeping with the assumption that you have a four-wheel-drive vehicle, you're gonna have
a front differential, a transfer case, and a rear differential.
You wanna make sure that you check those.
Generally, they're gonna have a check plug up along the middle/upper area of the differential
itself.
You also wanna make sure that you're caught up to date on your servicing because if you
fell behind, you definitely don't want anything to happen to your differentials when you're
driving the vehicle so you wanna make sure they're well lubricated and that's something
you wanna do for the transfer case right here.
If you're looking for the fill/check plug on your rear differential, it's gonna be on
the driver side right next to the axle like this.
If we're talking about checking the driveline system, you're gonna notice that you have
a rear driveshaft.
That's generally gonna go from either your transmission or your transfer case and it's
gonna lead to the rear differential.
On that rear driveshaft, you're gonna have some U joints, and those need to be able to
flex and pivot as needed.
Typically, when your suspension's going up and down this is gonna be able to go up and
down at the same time at the same time as this is rotating.
If these are seized or are damaged in any way, there's a possibility that they might
fail, you can also look at them and if you see any rust looking like it's coming out
of there, then generally that means that the fluid or grease is all gone inside there,
water made its way in and the bearings are rusting out.
That's very bad.
And if you're replacing one, you would obviously replace the other as a pair.
It only makes sense because the drive shaft's gonna have to come out of the vehicle.
So why not just do it while you're there?
For the front driveshaft, you might notice that it looks a little bit different than
the rear.
This is such that it has a little boot over here which is gonna be covering the internals.
If the boot's ripped or torn, there's a possibility that stuff could get inside there which could
damage this so you definitely wanna service it and/or replace the shaft as a unit.
So now you're looking at an overall view of the rear suspension of the vehicle.
You're gonna have a lower ball joint here so that's something that you're gonna wanna
check typically with a prybar near the ground.
You have the axle, of course, like we talked about.
You have your rear sway bar link.
You wanna make sure that's in good condition.
Up along here, you have this area.
You wanna make sure that you don't have any movement inside that joint.
And of course, any areas that you see just have like a rubber bushing of any sort like
this one, if it looks as though it's dry rotted and cracked, that's something that you're
definitely gonna wanna service because if it ends up separating, you're gonna have a
loose-feeling vehicle when you're driving down the road.
Obviously, while we're taking a peek under here, we wanna look at the exhaust.
There's a couple things we wanna pay attention to.
You're gonna have heat shields on it.
If they're loose, they're gonna rattle.
Especially with the vibration from the engine.
Sometimes with those, what you can use is some of these band clamps like this and that'll
kinda hold them on there so you don't necessarily have to worry about it but they are very important
because if they're missing, the heat from the exhaust could potentially heat up whatever
is near.
There's a reason for the heat shields and it's pretty much implied with its name.
You'd wanna continue down the exhaust and you wanna check all the areas that have joints.
If you see any black soot coming out of any areas, then you know that that's an area that
there's gonna be exhaust leaks from and it's pretty typical to have it around a joint of
some sort, along a seam of some sort like what we have on this particular vehicle.
You can see it right up along here.
That's due to the fact that moisture sits in this area and then it just rots out the
metal.
If you were to start up the vehicle, you could feel it right here.
You're definitely gonna feel exhaust coming out of that hole.
And just follow your tailpipe all the way to the rear.
Another common place that you might find an exhaust leak would be at the manifold.
Typically, where it connects to the engine.
And generally, you're gonna also find that there's a broken stud or mounting hardware
that holds the manifold to the engine itself.
If that's the case, you have to replace the gasket, more than likely resurface the manifold,
or replace it, and generally, you're also gonna have to drill and tap out that hardware
that's in the engine.
Looking along the driver-side frame of your vehicle you're gonna see your e-brake cable.
You wanna make sure it's not rusted in any way and you wanna also give it a tug to make
sure it's functioning as it should.
Sometimes what you might happen to find as it gets rubbed through on something like maybe
it's rubbing across this frame a lot, it gets a tear.
If that happens, there's a possibility that it could stop functioning and it could even
get stuck on which, of course, would be very bad.
You also wanna make sure that you go ahead and check your spare tire.
You wanna make sure that you have plenty of tread on it.
Obviously, you wanna make sure it's there because sometimes they're missing.
And also, you wanna make sure that you check your tire pressure in it.
It's very easy to forget but generally, if you look up in between some of the holes,
you're gonna find your valve stem and you can usually easily get to that.
Okay, friends.
That's pretty much what I've got for you for a 100K service on this Ford Expedition.
Of course, if I was gonna give you a bonus on this one, I would say to make sure that
that four-wheel drive works because it's not necessarily something that you're gonna be
using every single day but when you do need it, you kinda really wanna make sure it works.
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