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Old 04-05-2011, 05:56 PM   #1
08wrx440
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Default Engine Coolant Question

08 wrx
Long story short coolant went low, added about half a cup of water and now have actual fluid.

I got the Super Blue coolant from subaru, but it says directly on the bottle to not add water.

Should I flush the system and fill it up with all new coolant? Or am I fine to top it off?
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Old 04-05-2011, 06:34 PM   #2
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FWIW, my 2006 Owner's Manual says to change the coolant every 30 months or 30,000 miles. What does the OM for your YMM say?

If you are due, drop the coolant and refill it. Otherwise, top off the radiator and the overflow container as appropriate.

If the coolant is a pre-mix, which IIRC it is, then you do not add water.

Also, for future reference, do not add tap-water to the cooling system. Use a demineralized water instead. You don't want the minerals in the tap-water to bind to the fins of the radiator, heater-core, or other internal cooling system components, etc.
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Old 04-05-2011, 06:48 PM   #3
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Quote:
Originally Posted by Big-E View Post
FWIW, my 2006 Owner's Manual says to change the coolant every 30 months or 30,000 miles. What does the OM for your YMM say?

If you are due, drop the coolant and refill it. Otherwise, top off the radiator and the overflow container as appropriate.

If the coolant is a pre-mix, which IIRC it is, then you do not add water.

Also, for future reference, do not add tap-water to the cooling system. Use a demineralized water instead. You don't want the minerals in the tap-water to bind to the fins of the radiator, heater-core, or other internal cooling system components, etc.
Looks like I'll be having to flush it. I just hit 31k miles, whoops

I used bottled water fresh out of the case.

Good looking man.
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Old 04-05-2011, 09:58 PM   #4
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You don't need to flush it. It says that on the bottle as it's premixed with water. You are fine....coolant is not 100% coolant rather XX% coolant + XX% water anyways. You "diluted" your coolant by one cup.....not enough to even worry about when the whole system holds 2 gallons. Nice to see an honest question, but you have no need to worry your pretty little head none.

08+ Subarus use blue long life coolant that lasts like 100k if memory serves.
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Old 04-05-2011, 10:10 PM   #5
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Should be fine. And tap water is fine in cooling systems as long as you're not using hard water.
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