Coolant flush
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This is a discussion on Coolant flush within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So I'm gonna be doing a coolant flush here in a couple of days also replace the thermostat w/ a ...

  1. #1
    Registered User benson156's Avatar
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    Coolant flush

    So I'm gonna be doing a coolant flush here in a couple of days also replace the thermostat w/ a Grimmspeed 160* and coolant hoses w/ Samco sport hoses but I was wondering what coolant everybody runs? I called my local Subaru dealer and they want $20 a gallon for their mix, it seems a bit pricey but if that's what all you guys recommend I'll end up doing that. Also 8.1 QT to refill the system sound right?

    Thanks,
    Jaden
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    Registered User EvoEatr's Avatar
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    Personally since I work for Subaru all I ever use is Subaru coolant, they may all meet some of the same standards for everyone else, however knowing the havoc earlier Subaru HG's reeked I will always use Subaru brand coolant ( also dont ever buy the pre mixed its usually more expensive and your paying for half water )...Use distilled water to mix your coolant...Why are you installing a lower degree thermostat? Do you have a cooling system problem? I'm just mentioning this..Subarus are extremely touchy when it comes to certain aftermarket components thermostats being one of them ( also axles, ignition componants etc etc), I have seen brand new aftermarket thermostats cause problems within weeks of being installed..Anyways invest in one of these http://www.amazon.com/Lisle-24610-Sp.../dp/B001A4EAV0 ... Totally worth every penny...

    P.S: Dont forget to add the coolant conditioner

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    Registered User armindk's Avatar
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    I wouldn't go with a lower thermostat if I were you. It will be a waste of money and will mess up with the sensors of your car.

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    I REALLY don't recommend using any thermostat except for the OEM Subaru replacement. Many people before you have tried different thermostats, many of them have had problems. Best to avoid the situation all together.
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    Registered User benson156's Avatar
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    Okay, I'll ditch the thermostat then thanks for saving me some cash! How much coolant do I need to buy for sure then, will 2 gallons do?
    Hawk-eye Alliance #156

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Quote Originally Posted by benson156 View Post
    Okay, I'll ditch the thermostat then thanks for saving me some cash! How much coolant do I need to buy for sure then, will 2 gallons do?
    Well, the coolant system takes 8.1 qts. so 2 gallons would be just under enough for a straight up drain and fill, but with a flush, you should plan for an additional gallon at the least.
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    Registered User benson156's Avatar
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    Quote Originally Posted by Anub1s View Post
    Well, the coolant system takes 8.1 qts. so 2 gallons would be just under enough for a straight up drain and fill, but with a flush, you should plan for an additional gallon at the least.
    Thanks man, I'll get it done then.
    Hawk-eye Alliance #156

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    Moderator   Sasquatch's Avatar
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    I'd highly recommend using distilled water for the dilution and refill.
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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Quote Originally Posted by Sasquatch View Post
    I'd highly recommend using distilled water for the dilution and refill.
    If it's not a premix, which I'm not sure about from Subaru, then absolutely use distilled water. Too much variation with regular tap water, and distilled water is cheap as all hell at just about any grocery store. Good call.
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    Moderator   Sasquatch's Avatar
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    Quote Originally Posted by Anub1s View Post
    If it's not a premix, which I'm not sure about from Subaru, then absolutely use distilled water. Too much variation with regular tap water, and distilled water is cheap as all hell at just about any grocery store. Good call.
    The messy coolant flush procedure is one I have my dealer do even though I know how to correctly perform it. At ~$80 every other year I feel its well worth it.

    This allows for proper reclamation / recycling of the used coolant. I provide two gallons of supermarket distilled water for less than $2. They take care of the rest with Subaru coolant.

    Distilled water has no minerals or suspended metals to react with the chemical bombardment the diluted coolant mixture will see in an engine.
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    Registered User EvoEatr's Avatar
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    Subarus green coolant is not pre-diluted with water however the super blue coolant is....

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Quote Originally Posted by EvoEatr View Post
    Subarus green coolant is not pre-diluted with water however the super blue coolant is....
    Good to know, thanks. Do you happen to know the difference in the pricing between the two, or at least close to it?
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    Registered User EvoEatr's Avatar
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    Quote Originally Posted by Anub1s View Post
    Good to know, thanks. Do you happen to know the difference in the pricing between the two, or at least close to it?
    for the green I believe we charge around 18$ a gallon and the blue I believe its a tad more, around $28...

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