Radiator cap

[Chrishoughton1989]

Hello. I have a 1.3 rad cap with civic rad and when I drive hard for mile or so it pushes water out rad into expansion tank. Sometimes it over flows. What could this be ? Head gasket ? Faulty cap ? But it never overheats.

Thank you.

[TrisK]

That's the point of an expansion tank?

As it cools it will draw it back into the rad

[pick1]

That's the point of an expansion tank?

As it cools it will draw it back into the rad

The mans rite mate it will do that under heavy driving just leave it running for 5 and it will draw it back in

[Chrishoughton1989]

Enough to make the expansion tank overflow ?

[pick1]

I've seen it happen on a short track session so 10-15 minute spirited driving should pretty much do they same does it loose water , does your temp gauge go rite up ?

[Chrishoughton1989]

Temps fine. The rad isn't full to the cap it's sort a cm below the top. Is that normal ?

[pick1]

I wouldn't say that's out of the ordinary mate

[Chrishoughton1989]

Cheers. Worry over lol

[Mad Mike EP82]

mine has just done this found my radiator was cracked and leaking causing coolant to boil at normal temp and force its way out through the rad cap. check all you pipes and radiator first then start replacing stuff cheapest first rad cap thermostat etc

[Chrishoughton1989]

Thanks for help everyone. Sorted now.