How to bleed air out of radiator?
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This is a discussion on How to bleed air out of radiator? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; Im planning on doing a gauge install next week, and one of the gauges is for water temp. I purchased ...

  1. #1
    Registered User bulletSTI's Avatar
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    How to bleed air out of radiator?

    Im planning on doing a gauge install next week, and one of the gauges is for water temp. I purchased greddy adapter for easy install which requires cutting top radiator hose. Directions say, " coolant will be spilled so add more as needed, also do not forget to bleed air out of the radiator or engine may overheat." I was wondering if anyone knows how to air bleed the radiator? Thanks

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  3. #2
    Registered User wrx wagone's Avatar
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    1. Open radiator cap.

    2. Start car.

    3. Wait for car to warm so the thermostat opens.

    4. Watch for bubbles and dropping coolant level in radiator.

    5. Fill radiator as required.

    6. Replace radiator cap once bubbles stop.

    7. Fill coolant reservoir to "hot" mark.

    8. Drink a beer.
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  4. #3
    Registered User rr1911's Avatar
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    Quote Originally Posted by wrx wagone View Post
    1. Open radiator cap.

    2. Start car.

    3. Wait for car to warm so the thermostat opens.

    4. Watch for bubbles and dropping coolant level in radiator.

    5. Fill radiator as required.

    6. Replace radiator cap once bubbles stop.

    7. Fill coolant reservoir to "hot" mark.

    8. Drink a beer.
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  5. #4
    Registered User bulletSTI's Avatar
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    LOL thanks, I just wanted to make sure I have it the right way.

  6. #5
    Registered User bulletSTI's Avatar
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    Just installed water temp adapter into the upper hose. Tried to bleed the air out like mentioned in this thread, but I have no way of knowing if all air really is out. I had to close the radiator cap as coolant came bursting out after I let the car warm up for 10 mins.

  7. #6
    Registered User wrx wagone's Avatar
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    Coolant bursting out??!?

    Did you open the cap first then start the car, or did you start the car then open the cap?

    With the cap off, the coolant system can't build any pressure to "burst".
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  8. #7
    Registered User bulletSTI's Avatar
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    Cap was off at first, then I closed it when coolant started to overflow. I filled the radiator before I started the car. Anyway, gauge install is complete and car does not seem to overheat at this point. The only thing that went wrong is a slight water leak at sensor/adaptor connection. Im going to have to waterproof it some time tommorow.

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