Antifreeze for 2007 hyundai sonata and how to change
For "ordinary" antifreeze, the vehicle
manufacturers generally recommend coolant changes every two to
three years or 30,000 miles. Others say it's not a bad idea to
change the coolant every year for maximum corrosion protection
-- especially in vehicles that have aluminum heads, blocks or
radiators. But such recommendations may soon be obsolete. Several
antifreeze suppliers have just recently introduced "long
life" antifreeze formulations that claim to provide protection
for four years or 50,000 miles.
General Motors just introduced a new five year, 100,000 mile antifreeze
in its 1996 cars and light trucks. The new coolant is called
"Dex-Cool" and is dyed orange to distinguish it from
ordinary antifreeze (which is green).
The life of the antifreeze depends on it's ability to inhibit
corrosion. Silicates, phosphates and/or borates are used as corrosion
inhibitors to keep the solution alkaline. As long as the antifreeze
remains so, corrosion is held in check and there's no need to
change the coolant. But as the corrosion inhibiting chemicals
are used up over time, electrolytic corrosion starts to eat away
at the metal inside the engine and radiator. Aluminum is especially
vulnerable to corrosion and can turn to Swiss cheese rather quickly
when conditions are right. Solder bloom can also form in copper\brass
radiators causing leaks and restrictions. So changing the coolant
periodically as preventative maintenance is a good way to prevent
The basic idea is to change the coolant before the corrosion inhibitors
reach dangerously low levels. Following the OEM change recommendations
is usually good enough to keep corrosion in check, but it may
not always be the case. That's why more frequent changes may
be recommended to minimize the risk of corrosion in bimetal engines
and aluminum radiators.
One way to find out if it's time to change the antifreeze is to
test it. Several suppliers make special antifreeze test strips
that react to the pH (alkalinity) of the coolant and change color.
If the test strip indicates a marginal or bad condition, the
coolant should be changed.
Regardless of the type of antifreeze you use, it should be disposed
of properly. In many areas, it is okay to flush used coolant
down the toilet (sanitary sewer) as long as the amount does not
exceed a few gallons. But it should not be poured down a floor
drain or into a storm sewer.
Both types of antifreeze are biodegradable but take some time
to break down. Dumping used antifreeze into a storm sewer, ditch,
creek or on the ground can contaminate ground water and kill plants
and fish. What's more, used antifreeze picks up lead from solder
in copper/brass radiators. Lead is a toxic heavy metal that can
also cause pollution problems of its own.
Some areas prohibit ANY dumping of used coolant (sanitary or storm
sewers). They also may not accept used antifreeze in a sealed
container for landfill collection because eventually the container
will leak its contents into the ground causing possible ground
So how do you get rid of the stuff? You can take it to a local
collection center that accepts used antifreeze for disposal or
recycling, you can pay to have it disposed of as a hazardous waste
(yeah, right) -- or you can take your vehicle to a garage or service
facility that has a coolant recycling machine. The latter is
the best choice because it eliminates the disposal problem altogether.
Coolant recycling machines work their magic by a variety of means.
Some use filtration while others use a distillation process to
remove the harmful contaminants from the old antifreeze. Corrosion
inhibiting chemicals are then added to restore the coolant's corrosion
protection. The auto makers have all approved coolant recycling
as an effective means of eliminating coolant disposal problems,
and each publishes a list of machines that meet their specifications.
Recycled coolant must meet minimum standards of purity before
it can be reused.
Reverse flushing is the best way to change the coolant because
draining alone can leave as much as 30 to 50% of the old coolant
in the engine block. Reverse flushing also helps dislodge deposits
and scale which can interfere with good heat transfer.
The concentration of antifreeze in the coolant also needs to be
checked prior to the onset of cold weather. A 50/50 mixture of
antifreeze and water is recommended and will protect against freezing
down to -34 degrees F and boilover protection to 263 degrees F.
For maximum protection, up to a 70% mixture of antifreeze can
be used for freezing protection to -84 degrees F.
CAUTION: Do not use more than 70% antifreeze, and never run straight
water in the cooling system because it offers no corrosion, freezing
or boilover protection.
Take care and good luck
Nov 06, 2010 |
2007 Hyundai Sonata Limited Sedan