Auto Repair & Diagnostics : How to Diagnose a Cooling System Problem

Auto Repair & Diagnostics : How to Diagnose a Cooling System Problem


Hello, my name is Tom Brintzenhofe. I’m a
certified master mechanic from Reading, Pennsylvania.
Today, we’re going to talk about how to diagnose
a cooling system problem. Most vehicles have
one problem or another when it comes to cooling
system either generating too much heat, overheating,
not generating enough heat and runnin’ cold
all the time. Most problems you’ll find when
it comes to the cooling system is either dead
summer, when it’s real hot outside they tend
to overheat; problems in the winter, obviously
you have no heat. The first thing I’ll talk
about real quick is the thermostat. A lot
of majority of the heating and cooling problems
come from this thermostat. If it ever sticks
closed the vehicle will overheat. If it sticks
open a lot of times it won’t generate any
heat. And the thermostat sits right back here;
up beside this housing. The other problem
you might might find is a radiator. If a radiator
gets somewhat blocked from corrosion, pieces
of rust and stuff from inside the engine gets
blocked up inside here; again, it will overheat.
Another problem you might have is you won’t
have any heat on the inside. Engine’s runnin’
a good temperature; it’s not overheating,
not running cold, and again, you have no heat
on the inside. The first thing to do is after
it’s been started and warmed up to a good
temperature check these two hoses. You have
an in in hose and an out hose to your heater
core. On this jeep it’s real simple; the next
one here on the top. Put your hands on em’
as you’re running. Please keep your hands
away from the front of the engine. That tends
to hurt if you get your hands caught in there.
But these two hoses right here should be relatively
the same temperature goin’ in, goin’ out.
One’s going to be extremely hot, so be careful
when you touch it. The other one should be
slightly warmer, not not too much, but slightly
warmer. If they’re not chances are you got
a blocked heater core. If you got one hot
goin’ in, and the other one comin’ out still
cold it’s a blocked heater core. A lot of
times you can flush em’ out so you don’t have
to take the whole dash apart to change it.
Other issue you might have is it’s overheating
too much. Sometimes you’ll have a problem
with the water pump. The fins break off inside
it. Unfortunately, I don’t have one to show
ya’. And fins break off; they don’t move enough
antifreeze inside the motor to cool it off,
so again, you have an overheating problem.
The cooling problems on a on a vehicle are
relatively pretty easy to diagnose. You either
have, like I said before, either it overheats,
or it doesn’t generate enough heat. And what
I’ve explained to you in in this short clip
is it’s real easy to diagnose. You just follow
them few few small steps, and it’ll be a walk
in the park for ya’.


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