Coolant level

attrapereves

New member
  • Mar 18, 2014
  • #1
  • Does my coolant look low? This is after running the car for 10 minutes, then letting it sit for 10 minutes. My other sonic is right at the seam after running for 15 minutes and sitting for 10 minutes.

    SuperFudd

    Member
    • Mar 18, 2014
  • #2
  • $ub$onic

    The Sticker Guy
    • Mar 18, 2014
  • #3
  • I was thinking the same thing.

    Palmaris

    New member
    • Mar 18, 2014
  • #4
  • attrapereves

    New member
    • Mar 18, 2014
  • #5
  • sx sonic

    New member
    • Mar 19, 2014
  • #6
  • Papasonic

    Active member
    • Mar 19, 2014
  • #7
  • The owners manual states that the coolant level in the surge tank should be maintained at the level of the arrow, which is very near the seam of the tank. Arrow can be seen in the OP’s photo.

    It should be at that level when checked cold.

    vento

    New member
    • Mar 19, 2014
  • #8
  • What is that gurgling noise? Ive noticed that before, sounds like of like running water at idle. I always thought it was water trapped somewhere that had yet to drain out.

    Ive only had to top off my coolant once, it had dropped below the full line. Even now its about a finger below «full»

    ahtoxa

    New member
    • Mar 19, 2014
  • #9
  • OP, has your level been higher in the past? If so, you have a leak. The tank is pressurized on the Sonic, so evap isn’t possible and because it’s pressurized, the level fluctuates little to none.

    It is possible that you’re along with many of us, who have a slow leak. Usually it’s the waterpump (many had had it replaced), but sometimes it’s a small, slow leak that cannot be found readily.

    ChrisJ

    Active member
    • Mar 19, 2014
  • #10
  • If it was mine I would add quite a bit.
    I try to keep mine about 1/8″ above the seam in the tank when the engine is COLD and I don’t hesitate to have it 1/4″+ above.

    The worst that will happen is it will blow some out on the ground if it gets too full when hot.

    Dexcool + air in a system is BAD and I believe, is what caused all of the sludge problems early on in the 1990s. Incorrect gasket designs caused leaks and leaks caused air. I’ve always kept my Dexcool cooling systems overfilled and have never had a complaint since the 90s.

    Add enough premixed fresh dexcool to bring it up about as far above the seam as it is below it right now, about a 1/2 inch or so? Then put the cap on and after you drive it and let it cool check it again. Expect it to drop some but it should end up around or slightly above the seam. If it ends up lower, add more and repeat.

    While I believe ahtoxa is correct, he is only partially correct. I do believe the system breaths some air in and out of the expansion tank which would also mean some moisture leaves with it. How much I don’t know, but it’s not much. I wouldn’t expect to lose that much even after 150,000 miles.