996 Intermittent water loss

[JSS 911]

Rigth think it might be the header tank , but does not happen all the time . First time noticed after a short run out , parked up and noticed a small puddle of collent under area of header , half a cup ,toped up . Went out for a blat everything ok . Few weeks later checked level down by about the same , topped up .Did the Kent re run about 400 miles all ok ! whats going on

[Ballcock]

Could be the expansion tank has had it , or one of the feeder lines to/from the tank is perished/not connected correctly , or the valve is dicky on the tanks cap.


I'd be betting on the tank .. It often starts to fail with a hairline crack that can take weeks to develop into a full blown leak.

Good news is it's not going to be that expensive a fix ,prob best if you bring it to an indie for a leak test .

[stuartdenton]

Had the same problem, changed the header tank, still a slight loss. Then changed the filler cap, everything fine.

[woogie]

I had same problem, first I changed the cap for the new type one. Then when that didn't work I had a new header tank fitted at the local OPC.