Add the coolant mixture
The optimum coolant combination is a 50/50 mixture of antifreeze and water. Any greater
concentration does not significantly increase the
efficiency of the coolant. Actually, the more
antifreeze you add above 50 percent, the lower your
protection becomes. The 50/50 mixture will produce
freeze protection down to -34F (-36C), and boilover
protection up 250F (121C).
Although regular water will do, the refilling of
the system should be done with distilled water. Why
bother with the extra expense? Distilled water
doesn't contain any minerals which can dissolve and
turn the coolant into a corrosive compound.
There are three ways (at least) to refill the
- Fill the radiator halfway with water.
Can't see into the radiator? Estimate the amount
of water based on the amount of coolant that you
drained out. If you drained out two gallons (8
liters) of coolant, then you need to add one
gallon (4 liters) each of water and
- Using a funnel, fill up the radiator with antifreeze.
A second way:
- In a separate clean container, mix antifreeze and water in a 50/50 ratio.
- Add the 50/50 mixture until the
radiator is full, and store any extra coolant.
A third way:
- Pour in a half container of
antifreeze. This usually comes in one-gallon (4
liter) containers, so add a half-gallon (2
- Add to the radiator an equal amount
of a distilled water. Then mix water into the
antifreeze container (which still has antifreeze
in it). This will create the 50/50 mix, which
you can add to the radiator until it's full.
It's good idea to have a little
extra coolant after this fill-up, because the
coolant level will drop slightly after you do
Step 9. The excess from this step can be
used to top off the radiator a little later.