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Old 09-16-2009, 11:14 PM   #1
Forgiven
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Default Changing out coolant

I have a 2005 NA Impreza and it looks like the coolant has never been changed. I have drained the rad and plan to remove the hose to the thermostat housing to get some more fluid out. Is there a drain plug in the block itself, or does most of it drain out anyway when the rad is drained?

All anifreeze now states that it is good for preventing corrosion including aluminum. Why is it the manual still tells us to add the subaru approved suppliment to the antifreeze? Just added protection? Really necessary? Thanks.
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Old 09-17-2009, 12:17 AM   #2
Uncle Scotty
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waste of time adding anything....that was for the older cars that had bad headgaskets

fill with water.....run for a day...drain and refill with coolant/water mix that will suite your climate and expected low temperature
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Old 09-17-2009, 12:21 AM   #3
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Should he spend an extra dollar or so and get distilled or deionized water instead of using just tap water?

Whether or not, do what Uncle Scotty suggested. This way you're assured to cycle out and dilute most of the remaining coolant that would be in the block & heater core that would not come out from a regular draining of the system, whether by draining the radiator only and/or pulling the lower radiator hose.
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Old 09-17-2009, 12:40 AM   #4
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Quote:
Originally Posted by Uncle Scotty View Post
waste of time adding anything....that was for the older cars that had bad headgaskets

fill with water.....run for a day...drain and refill with coolant/water mix that will suite your climate and expected low temperature
i thought the official word was that subaru conditioner was still highly recommended as an additive? at least that is listed in the nasioc bible...

http://forums.nasioc.com/forums/showthread.php?t=504002
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Old 09-17-2009, 12:45 AM   #5
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Originally Posted by rkramer View Post
i thought the official word was that subaru conditioner was still highly recommended as an additive? at least that is listed in the nasioc bible...

http://forums.nasioc.com/forums/showthread.php?t=504002
meh......ive been told that it stopps up heater cores if ya use too much of that gunk

only if ya have an external coolant leak that ya think if from a head....then use it
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Old 09-17-2009, 01:16 AM   #6
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Thanks for the posts guys, I do use distilled water. So I guess that additive is not necessary. I have noticed that these motors have head gasket problems and that must be the factory fix...get them to put goop in the motor....I'm torn...I don't want my head gaskets to leak either.
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