Specifically from the cap.

After a good drive, I'm seeing a slow, steady drip of coolant from under the cap. Thinking the cap was bad, I replaced it to no effect. Thinking that cap was bad, I replaced it, and it may have slowed the drip.

The radiator is new, aluminium.

The temperature gauge reads at or below N, with no suspicious fluctuation.

The coolant is clean. No sign of oil or other detritus.

What should I be checking next?

 

Under that cap is a hose running aft, and diappearing thru the inner guard panel, and down to the atmospheric coolant tank hidden in that area.

That hose has a metal joiner at the grommet section of the inner guard. It rusts and clogs.

The atmospheric tank gets a mud build up in the bottom. The hose sits IN this mud, effectively blocking the hose.

The bribbling out of the cap is due to the system NOT being able to "breath" via that hose when the cap releases its set pressure.

Remove the front LH wheel, remove that access panel, remove that tank, wash it out, refill it to 1/2 way with fresh coolant and reinstall.

Whilst that hose is dangling free, ensure it is also "unclogged". I usually run a new hose WITHOUT that crappy joiner.

Another simple Jag fix, enjoy.

 

I was wondering when I'd have to monkey with that tank. Thanks!