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    Pressure in the coolant bottle

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    • J
      johncroz last edited by

      My sons coolant bottle cap keeps blowing off with high pressure the bottles been replaced recently by his mate any ideas thanks

      declan 2 Replies Last reply Reply Quote 0
      • declan
        declan @johncroz last edited by

        @johncroz happened to me so I cable tied the lid down with good results

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        • declan
          declan @johncroz last edited by

          @johncroz however this can be a sign of head gasket failure and some other pretty serious stuff so I don't reccomeny doing what I did but each to there own

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          • Calum
            Calum last edited by

            It's going to be head gasket.

            Quick way to test is see if there is any oil in your radiator.

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            • J
              johncroz last edited by

              Cheers for the advice

              declan 1 Reply Last reply Reply Quote 0
              • declan
                declan @johncroz last edited by

                @johncroz turned out my head wasn't tight so I think that was my problem but I still keep the tie on just in case

                Calum 1 Reply Last reply Reply Quote 0
                • Calum
                  Calum @declan last edited by

                  @declan That's not really a good idea.

                  When pressure is addded to the cooling system, it WILL find a way out. Since liquids require immense pressure to compress, the easiest option is for the liquid to move to a different location.

                  A nice plastic cap is ideal escape mechanism, requiring little force to actuate.

                  If however it can't escape via there, it will just find an alternate route. Like the thermostat housing.

                  I had this on my Starlet when I bought it. The Fcking bodge jobbers simply removed the thermostat to stop water leaking through there.

                  But water was leaking through there for a reason, the head gasket was blown.

                  Consequently the coolant just leaked out the overflow bottle. And by the looks of it, the coolant had been doing this for some great length of time!

                  So let coolant blow out the bottle, rather that than through the radiator core.

                  But better still, fix the problem.

                  declan 1 Reply Last reply Reply Quote 0
                  • declan
                    declan @Calum last edited by

                    @Calum I'm pretty sure mines all good mate

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                    • J
                      Jens Eskildsen last edited by

                      An overfilled overflow bottle can also do this.

                      Calum 1 Reply Last reply Reply Quote 0
                      • Calum
                        Calum @Jens Eskildsen last edited by

                        @Jens-Eskildsen If the bottle is overfilled, it SHOULD just leak out the overflow hose.

                        But so long as the pressure is gradual. If it gets a surge it will rupture the cap.

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