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Frost Plug


In relatively new vehicles, as a rule, nobody takes much notice of the frost plug. The whole cooling system remains sealed, and the anti-freeze filled in by the factory keeps the radiator water fluid. For the most part, only someone who wishes to install an electric zone heating in very cold countries would perhaps install this instead of a frost plug. Actually, older vehicles, or also those imported from very warm countries, cannot do without a so-called frost plug. The reason is, they are necessary, as a rule, if only for the purpose of removing the quartz-sand which keeps the whole coolant area in the cylinder free during the casting process. Whether they are now called frost plugs or not, through corrosion they can become leaky and thereby cause problems.

Frost plug is also available in the cylinder head.

How it works

Due to the fact that hardly anyone would re-insert the same frost plug that was taken out again, one may puncture the plug, to make removal easier. In theory, it could also fall into the engine block, so take care! New frost plugs are often inserted, depending on the manufacturer, using special tools. It can also be done with a little intuition and sealing paste. The biggest problem is the accessibility. As can easily be seen in the above figure, the horizontal inlet manifold connections show just how difficult it is to get to the plug without first removing the engine. 09/09