- Hey, how's it going folks?
Today, I'm gonna show you how
your car's engine's cooling system works and operates
but not just that,
I'm also going to walk you through a diagnosis procedure
for a car with suspected cooling system issues.
Now, before we get started,
I would just like to mention
that if you see any tools or products
used in this video that peak your interest,
I put links to them in the description box.
So, don't be afraid to click on them and check them out.
Alright, so the job of your cooling system
is to first make sure that the temperature of your engine
does not rise beyond a certain point.
And the components that help it to achieve this
are going to be the radiator,
the radiator cooling fans
that could be electronically controlled like this one here,
or fans that are belt driven
like what we have on this Ford here,
And a belt driven water pump,
which, of course, is responsible
for circulating coolant throughout your cooling system.
Now, your cooling system also has a second function
which is to make sure
that your engine reaches a preset operating temperature
before it starts cooling it down.
And how it's able to do this is by using a thermostat,
which is what you see right here.
Alright, so we'll do a quick demonstration
on how everything works together on this whiteboard.
And, for the sake of argument,
we're gonna assume that we are going to start our engine
from a cold start.
Alright, so from a cold start
our thermostat is going to be in the closed position,
which is the position you see here.
In the closed position,
it does not allow for any coolant to pass through it.
So, here's our thermostat on this diagram
and when this is closed, it keeps coolant inside the engine.
See, inside your block you have these coolant passages
that are there so that coolant
can circulate through your cylinder block
and keep the cylinder block cool during normal operation.
And, of course you also have them inside your cylinder head
all around the combustion chambers as well.
So, the job of your thermostat is to remain closed
until the coolant inside your engine
reaches a preset temperature,
and then this valve opens
and allows for the circulation of coolant
throughout your cooling system.
And, once the thermostat opens,
your water pump is gonna pump coolant
through this upper radiator hose,
into your radiator.
And, once coolant gets inside your radiator,
it's cooled down by exchanging its heat
through the fins of the radiator.
And then, from there, once its cooled,
it goes back to the engine
and runs through the engine
and keeps it cool.
And from there, again, the whole cycle repeats itself.
Now, I should mention
that not always coolant flows
from the lower radiator hose through the engine
to the upper radiator hose.
Sometimes it goes the other way around.
And when it goes the other way around,
your thermostat is going to be right here
where your radiator hose goes to your engine,
keeping the coolant inside your engine.
As is going to be the case
on this 2000 Subaru Legacy with a 2.5 Liter engine.
So on this engine,
coolant flows from this one into the engine.
And once the coolant is properly warmed,
the thermostat will open
and then from there,
it will flow back through the radiator,
and the whole thing will repeat itself.
Alright, so that was simple enough,
but now let's go diagnose
and fix a car that I suspect has some cooling issues.
(car engine)
But before we do that, we gotta do something.
I'm sure you guys can probably guess just by listening,
what's about to happen.
(ice cream truck)
Yeah, thank you.
Yeah, ice cream.
And the vehicle that we are going to be working on
is going to be this 1996 Chevy truck
with a 5.7 liter V-8 gas engine.
And the issue we've been having with this truck,
is that the temperature gauge
does not rise after the car is supposedly warmed up.
So, we're gonna check the thermostat first,
because that's going to be the main culprit.
If that's not it,
then it would probably be
either the coolant temperature censor,
or the gauge in the dash.
But we're gonna start off with the thermostat.
Alright, so things are gonna be a little tight here,
but here's a look at our upper radiator hose.
And if we follow that, obviously,
that goes to our thermostat.
And all the way here on the other side,
on the lower side of the radiator, right down there,
if you can make it out, there is our lower radiator hose.
So, next we're gonna start our engine.
But, you wanna make sure you start with a cold engine.
(car engine)
Alright, so here's the temperature
for our upper radiator hose: 90 degrees.
And the temperature for our lower radiator hose:
just about the same.
Now, if our thermostat
and the cooling system is working properly,
the temperature for the radiator hose,
while the thermostat is closed,
should remain just about 90 degrees.
But, the temperature for the lower radiator hose,
should start to climb now.
Alright, so it's been a few minutes
since the engine has been running.
Let's recheck our temperatures.
Here is our upper radiator hose at 108.
That's interesting.
And here is our lower radiator hose at 108 also.
So, there is a clear example
of a thermostat that is stuck in the open position.
Thermostat is stuck open,
therefore, it doesn't allow
for your engine to properly warm up.
See, when it's stuck open at start-up,
the coolant just continuously flows
through your cooling system
and its temperature,
is not allowed to rise to the correct level.
And again, another sign that your thermostat is stuck open,
is you not being able to get any warm air inside the car.
And, look at our temperature gauge
after about seven minutes: stuck at pretty much hundred.
Alright, so there now that we have verified
that our thermostat is indeed stuck open,
we are gonna replace our thermostat.
Alright, in order to remove our thermostat,
we're gonna first start off
by removing our air filter housing.
And we're gonna do that be removing these two bolts here.
(drill squeal)
And then this one on the side.
And then we're gonna loosen this clamp
that is attaching it to our MAP sensor.
Alright, now we should be able to get it out of here.
Alright, next we'll go inside the car,
and then we need to obviously
remove the little piece that's covering our engine.
It's pretty easy.
There it is.
It's only held on there by four bolts,
two on the bottom and two on the sides,
and then there is, of course,
this little plastic cover that's sitting over it.
Then, using my long ratcheting wrenches,
I'm gonna remove this bolt that's holding in this air tube
that's going to the top of our throttle-body.
So now we can just lift up on this end
and then go to the front of the engine
and then on this end, we gonna first remove this connector
that goes to our MAP sensor
and then wiggle this
and we should be able to get it out of here.
There's gonna be another connector
for our inlet air temperate sensor
that's just behind our MAP sensor.
And also, a PCV hose that's on the side.
I'll show you in a bit.
But there, this is the PCV hose
that goes on the side that you need to remove.
Alright, so if you follow the upper radiator hose,
it goes around, loops around,
and there, is the look at our thermostat housing.
Looks like there are two studs
on this side and that side that are holding it in.
This one also has an extra nut here
that also holds a ground cable.
That's very important,
and you want to make sure you put that back
when you go to reinstall this.
And here's a look at a coolant temperature sensor.
That's just on here.
So we're gonna actually go with this one first.
Alright, so first this upper bolt.
And, there's the nut that's holding this ground wire in.
Now, before we remove those two nuts
that are holding our thermostat housing in,
it's a good idea, obviously, to drain
the coolant from your engine.
Alright, here's the rear one.
Alright, now we'll just pull this
and then let the rest of the coolant drain out.
There we go.
Alright, here's a look at our suspect.
I'm just gonna yank it out of here.
There we go.
And well what do you know?
It is stuck open.
You can see right through it, right there.
And here's a look at our new thermostat
and as you can see it is closed
and it only supposed to open
when it reaches a predetermined temperature,
which is 195 degrees for this thermostat.
Alright, so we'll put our new thermostat back in,
make sure its evenly seated where it's supposed to be.
And then I'm gonna spend some time
cleaning the mating surface on this end.
On the thermostat side it's not as important
because there's a little seat or a groove
where the seal goes inside.
(high pitched whine)
Alright, so putting it back together
is gonna be pretty much the reversal
of the removal from here.
So I'm not gonna get that on video,
but we'll cut to the, next we'll cut to where
we gonna do the temperature test
on our upper and lower radiator hoses.
Alright, here we go.
(engine starts)
Alright, a few minutes later,
this upper one is about 80 - 81.
This lower one, however, is now about 92 - 92 1/2.
Now the temperature of these hoses
is not obviously the temperature of the coolant.
For that, we gonna go inside the car
and check our temperature gauge.
Alright, as you can see,
it's only been a couple of minutes
but we're already up to about 150 according to our gauge.
So, things are definitely working proper right now.
Alright, so in the lower 80's.
And this bottom one is about 123 - 124,
and climbing steadily.
And our thermostat just opened, I believe,
now we're at 119 - 120 on this upper one.
And we are much cooler now on the lower one: about 98.
So that's about 20 degrees or so cooler.
Again, that's the temperature difference
between the two hoses.
I don't exactly know how much cooler the coolant is
when it passes through our radiator,
but it's obviously much cooler.
So that's it folks,
hope you enjoyed watching this video.
If you did though, do me a favor and share this video
on your favorite social network.
And also consider checking out these other related videos
of which I put links to
on this side of your screen that you can click on.
There will also be links
in the description box down below as well.
Alright, thanks for watching.
I'll see you guys next time.
(heavy rock music)
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