Hi. I'm Mike from 1AAuto. We've been selling auto parts for over 30
years! In this video, we'll show you how to diagnose
a failing water pump. These tips should cover most vehicles. This vehicle here has a complaint from the
owner of overheating or running hot. The gauge was between normal operating temperature,
about half way, and to hot. It never actually overheated, but they also
complained of a coolant smell, which is like a sweet smell. A lot of people describe it as like a maple
syrup smell, not as tasty smelling, but very sweet and sugary. To start looking for leaks, we're going to
start by looking under the vehicle. Is there anything leaking on the ground? Coolant can be green, orange, pink, blue,
sometimes it's yellowy universal color, of course, this would be straight water, if you're
running straight water in a climate where you could run water. It will probably be hard to tell what color
these are if they've leaked on the ground. You'll have to take a paper towel and soak
it up from the ground, and then you'll be able to tell what color it is. The overheating condition tells me there's
something wrong in the cooling system. How do I know that it needs a water pump? We have to start at the basics first. If the temperature seems stable before I shut
the vehicle off, and it's warm, I want to listen and see if the electric fans that pull
air across the radiator are working because that will cause, if they are not working,
the car may overheat while it's sitting in traffic and idling because you have no air
flow over the radiator. This is exactly what would be behind the radiator
in this vehicle. Most cars have a similar setup. They have two cooling fans. One would be a main cooling fan, the other
one will come on when you turn your air conditioning on for additional cooling. It's typical that if you just have your car
idling without the air conditioning on that only one fan will be running, and then when
you turn the air conditioning on, the other fan should come on as well because your air
conditioning puts an extra load on the engine and it needs more cooling. Even though this coolant reservoir is full,
that doesn't tell the full story because the owner did tell me that he topped off the coolant
reservoir. The coolant could still be low in the radiator. Now, in this particular vehicle, it has a
cover. I had to remove all the plastic clips to pull
this off to get to the radiator cap. With this out of the way, just to show what's
going on, before you open the radiator cap, you need to let the vehicle cool down. Wait however long this take because you need
to open the cooling system, which when hot is under pressure. Opening a hot radiator cap will cause a bunch
of steam and boiling coolant to come out. Treat it with the same caution as a boiling
pot of water on the stove. It's just as dangerous. Even if it's just warm to the touch, there
still might be pressure. Wait until it feels like ambient temperature
before opening the radiator cap. This one feels nice and cool, so I'm going
to open it up. I'm going to look inside and check the level. When you look down in here, you might be able
to see part of the aluminum radiator core, but coolant should basically be at the top
of this filler neck. It should be really full of coolant. This one is not. It's low. I can actually see the aluminum radiator part
of it. It's maybe, like, an eighth of the way low,
so I shouldn't be able to see any of that radiator. I want the coolant all the way up to the top. That still tells me that because this is low,
there is a leak somewhere in the system. I'm going to start with the obvious. I'm going to look, I can see the top radiator
hose right here by the filler neck. It looks nice and dry. This dirt, this stuff, that's from driving
down the road. The clamp looks good. I don't see any signs of dried coolant, or
even leaking coolant. Follow the hose. It goes into the engine compartment, connect
to the engine up here. Again, that looks nice and dry. I don't see any signs of leaking or dried
coolant. I'm going to go find the lower radiator hose. It's on the opposite side of the radiator
on this engine. You can kind of see it. That's where it goes into the engine, so I'm
going to backtrack and follow it down. I can just see where it's going into the radiator. That looks nice and dry. I don't see any signs of leaking coolant. Radiator hose looks in good shape. Follow it back up, see where it connects to
the engine. It also looks to be in good shape. No leaks there. I'm going to look up here towards the firewall. There should be a couple of rubber hoses going
into the firewall. Those are heater core hoses. This vehicle has a couple of other hoses for
rear heating, but just looking at all those junctions in there, I don't see any leaking
coolant or any signs of leaking coolant. Follow those hoses back to where they connect
to the engine. It's difficult to see, but they do connect. The heater hoses are here and I can see them. They go down and they connect into the engine. They are nice and dry and I don't see any
coolant leaking. I don't see any signs of coolant. You might see coolant puddling on top of the
engine here in the opening, or signs of dried coolant. I don't see any. I'm going to move on. We've got our vehicle lifted into the air,
but you can do this by simply looking underneath. On the ground there, I can see there's some
coolant that dripped out from somewhere, so now I want to find where that came from. Of course, if you're on pavement and you can't
tell what color that fluid, and you're trying to figure out if it's coolant or not, you
could use a paper towel. That's orange. That's coolant from my vehicle here. I want to find out where it's coming from. I'm just going to put this down here. Here's a clue. This is some coolant that dripped down and
dried. It's sort of dried, but you can see it's real
sticky and slippery, almost like a soap and it has the color of coolant, kind of orangey. It we follow it up, it's pointing up somewhere
towards the engine. There's a rubber cover here. Your vehicle may have a plastic shield here
protecting the engine. Go ahead and pop out clips or bolts, whatever
is holding it in. This way, I can flop it up out of the way
and I can see on the engine if anything is leaking. You may need to look for signs of coolant
leaking or dripping down the engine. On our vehicle here, the engine is made out
of aluminum and there's some light, white, sort of, drips, but they are dried and they
coincide from this area here, which is the water pump on our vehicle, and dripping down. Many water pumps have weep holes in the bottom
of them, which is behind the pulley. When the pump seals are damaged, coolant will
weep out of the hole. It starts out as a drip and eventually as
it gets worse, it will leak like a firehose. This is another example of water pump failure. You can see the dried coolant. It's been leaking down the engine for a long
time. All this grime is stuck to the engine. The water pumps, in both of these examples,
will need to be replaced before they fail completely. This is our old water pump from our vehicle. You can see there is the weep hole there. It's actually dry. What that does is this part of the water pump
is sealed against the engine, so there's coolant up against here. The shaft that drives the impeller here to
pump your water goes all the way through and it's turned by the drive belt on this pulley. There are seals inside on that shaft and if
they fail, they will leak out here at the weep hole. On this one, it appears that the seals had
gone bad and it was leaking out of this little pressed in fitting here. You can see it's corroded and it's wet with
coolant, and that's where our coolant leak was coming from. Typically, if the water pump is failing internally,
you'll have coolant come out of that weep hole. Water pumps aren't a normal wear item, but
if you have a vehicle with a water pump driven by the timing belt, it can be hard to replace
when it fails. A common practice is to replace it during
regular timing belt maintenance. The next time you need a water pump, visit
1AAuto.com and for water pump installation videos, visit our YouTube page Thanks for watching. Visit us at 1AAuto.com for quality auto parts,
fast and free shipping, and the best customer service in the industry.
