405GLD92 Hole at top of header tank

[stan108]

Hi I am losing coolant. After a 20 min motorway journey today I noticed coolant dribbling down from the engine compartment (which was not hot).
I traced it a a small regular hole on the top of the header tank just underneath the filler cap. I had not seen this hole before but it looks as though it is meant to be there. I have not been overfilling the header tank, and the engine temp is normal.
Any advice would be appreciated.

[oldpug]

May be the start of a headgasket job? it could be leaking,presurising the system and pumping some water out.

[stan108]

Thanks oldpug. Expensive then, are headgasket jobs successful & worth doing on a 135k miler ?

[stan108]

I have just ordered some Steel Seal, worth a try.