Sonata Coolant Change

Anyone know what the proper procedure for doing a coolant change on a 2006
Sonata is? "Draining" the coolant as instructed in the manual results in
about 2 1/2 quarts making it out of the system - basically, the radiator,
and the hoses. The rest of the coolant - about 6 quarts - the lower part of
the engine, and heater core, etc. Is there a drain plug on the engine
somewhere to really do the job that's not mentioned?

 

There's a couple plugs on the (V6) engine block that are hard to get to and
that I've never been able to remove when properly tightened. I don't
recommend trying to remove them. They were so tight I was afraid of
breaking something. Draining the radiator was really all that was implied
in changing the coolant, which has a prescribed interval of 5 years on this
vehicle.

 

I have always installed one of those prestone flush 'n fill kits on
all of my cars, to help get rid of the old coolant without going to
extreme methods. They are inexpensive, easy to install, and I think
it has to be better than leaving all that old coolant with it's
worn-out corrosion inhibitors in the engine block and the heater core.

http://www.prestone.com/products/accessories.php
(scroll down to the bottom of the page.)

hth,
me