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Thread: Bad radiator cap?

  1. #1
    Supramania Regular
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    Default Bad radiator cap?

    So what exactly would be the symptoms of a bad radiator cap?

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

  2. #2
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    Default Re: Bad radiator cap?

    Over pressurization of the cooling system,
    lack of presure in cooling system,
    Sustained improper pressure in cooling system,
    Collapsing radiator hoses,
    exploding radiator hoses,
    Vacuum in cooling system,
    Overflow level never changes,
    cap is leaking coolant out,
    cap is missing parts of itself,
    etc.

    What are you dealing with that leads you to think the cap is bad?



    cliffs: a lot of things can happen, it just depends on how it fails :P
    -Steve
    91 Supra- built 7M, Billet 67, AEM. Ya know, the 'wrong' engine...
    Best dyno: 788hp, 674tq @ 31psi on E-85.
    Best 1/4 mile: 11.366 @ 130.52

    My build thread: The Toyotanos Build!

  3. #3
    Formerly ChrisC
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    Default Re: Bad radiator cap?

    Pushes coolant into the overflow bottle as it warms up. Eventually pushes enough to spit on the ground usually before it even gets to temperature.
    Project Silver Supra

    400+ whp 7MGTE

    http://www.supramania.com/forums/sho...55#post1567655

  4. #4
    The Asshole
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    Default Re: Bad radiator cap?

    all of the above + BHG

  5. #5
    Formerly ChrisC
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    Default Re: Bad radiator cap?

    Quote Originally Posted by ATL88Supra View Post
    Bhg
    Leave this guy some faith in it only being a rad cap!! lol
    Project Silver Supra

    400+ whp 7MGTE

    http://www.supramania.com/forums/sho...55#post1567655

  6. #6
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    Default Re: Bad radiator cap?

    pull the cap off and check the rubber gaskets on it. sounds like its not sealing properly. also a new rad cap is 5 bucks? if it looks bad, try a new one.
    my build: http://www.supramania.com/forums/sho...t-with-no-name...
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  7. #7
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    Default Re: Bad radiator cap?

    Quote Originally Posted by enjoi.this View Post
    Pushes coolant into the overflow bottle as it warms up. Eventually pushes enough to spit on the ground usually before it even gets to temperature.
    This is pretty much what I'm experiencing. I have two different radiator caps, BOTH are pretty old caps. The one I originally had on I drove for about 2 hours and a decent amount of the coolant had been pushed out into the overflow tank and started to drip out onto the ground. Once the car cooled I took the cap off and couldn't see any water in the radiator so I had to add some. Second cap I had I put on to see if it would make a difference on the two hour drive back home. With the second cap it did let some coolant out but not nearly as much. I took the cap off again after cooling and I could still see water near the top of the radiator only like 1/4 inch down. Should I get a new cap?

    I went to autozone to get a new cap but the one they had for my car didn't fit my radiator at all, it was to small.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

  8. #8
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    Default Re: Bad radiator cap?

    Quote Originally Posted by ATL88Supra View Post
    all of the above + BHG
    This is exactly why I didn't post my symptoms in the very first post. I've been around long enough to know how that will end up. I have good reason to believe its the cap, but can't find a new one that fits.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

  9. #9
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    Default Re: Bad radiator cap?

    Quote Originally Posted by suprafanatic View Post
    This is exactly why I didn't post my symptoms in the very first post. I've been around long enough to know how that will end up. I have good reason to believe its the cap, but can't find a new one that fits.
    If you're having trouble finding a decent cap, do yourself a favor and go to your local Toyota dealership. The extra $10 is completely worth it.

  10. #10
    What will we break today?
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    Default Re: Bad radiator cap?

    Go to the dealer- should be around $15 and it'll fit for sure (unless you're running an aftermarket radiator) But even then I'm using an OEM on my Koyo.
    -Steve
    91 Supra- built 7M, Billet 67, AEM. Ya know, the 'wrong' engine...
    Best dyno: 788hp, 674tq @ 31psi on E-85.
    Best 1/4 mile: 11.366 @ 130.52

    My build thread: The Toyotanos Build!

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