Anonymous asked in Cars & TransportationMaintenance & Repairs · 4 weeks ago

is it normal when i take off the radiator cap ...?

Coolant slowly pushes up n starts to overflow, engine ON n warm. Is that normal ?

15 Answers

  • 4 weeks ago

    Yes, When you released the radiator pressure cap you should have heard a pressure release as well as hot coolant.

    From now on always allow the engine to thoroughly cool before unscrewing a radiator pressure cap. Nowadays, always check the coolant level by checking the coolant level in the plastic coolant recovery reservoir when the engine is stone cold. It should be at least half full.

  • zipper
    Lv 6
    4 weeks ago

    If your tank is full to start with: Hell Yes!

  • Poppy
    Lv 7
    4 weeks ago

    Today’s cars are not meant to be opened at the radiator, there is an overflow jug. Use it instead.

    • Anon4 weeks agoReport

      Who said it's a  Modern car? Might be a Model  " T". Would explain ooze instead of a hot geyser. 

  • 4 weeks ago

    yes it's normal.  When the cap is on, the coolant is pressurized, and that keeps it from boiling. (Under normal conditions)

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  • L.N.
    Lv 7
    4 weeks ago

    Yes, if the cap was on it would go into the reservoir tank as it got hot and draw it back out as it got cold.

  • 4 weeks ago

    You're supposed to let the motor cool before taking the radiator cap off. If the motor is at operating temperature and running you'll have some coolant come out from the 16 pounds of pressure in the system.

    Run the motor for a good 15 minutes with the radiator cap off and watch for air bubbles coming out of the radiator neck. When the bubbles stop the system should be purged of air.

    If the coolant shoots out of the radiator non stop you have a bad head gasket.

    Source(s): Mitsubishi Master Tech
    • Tom4 weeks agoReport

      Coolant keeps coming out but slowly, not shooting out. 

  • 4 weeks ago

    Don't take the radiator cap off. The cooling system is under pressure. Check the level by looking at the overflow tank.

    • Anon4 weeks agoReport

      If there IS an overflow tank...none of my cars have one. 

  • 4 weeks ago

    Yes, the coolant is under pressure so only remove the cap when the engine is cold to avoid scalding. 

    • FØXY Ðï
      Lv 4
      4 weeks agoReport

      Yes, especially when a troll calls you illiterate for a genuine typo. 

  • 4 weeks ago

    Yes. Warm water/coolant expands.

    • Anon4 weeks agoReport

      Solids gasses, and plasma all expand too when heated under atmospheric pressure. 

  • 4 weeks ago

    Yes it s loud and useless

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