Hello everyone,
I drive a 2000 xkr as my daily drive, and today I noticed coolant leaking from the cap. Looking at the cap and it looks fine, no cracks etc. Apart from that, the car is running really well as usual.
Any ideas? 😀

 

If you are sure it is coming from the cap, then you need a new cap regardless of what it looks like. System is under pressure and will find leaks before you do.

The good news is that caps are cheap. About $20 USD.

Check the expansion tank itself, but they tend to leak at the seam.

 

Agreed. Replace the cap. They do tend to fail over time. Had to replace the cap on my wife's 2006 XK8 earlier this year....

 

Ok, will do. I've done about 2000 miles over the past month or so and before that it's been driven around town and not really driven properly.
Really appreciate the replies. I will check the seam too, as this is where the leaked coolant collects. If the seam is on the bottom half of the tank, then I know it's just a cap as no coolant has run past the join, will have to check again. Hopefully it will be worn cap and nothing else��
Many thanks��

 

Or you can just replace a $.50 O ring. I did it to mine, and problem solved. Save the other $19.50, and have some fun with it.......Be cool.....Mike

 

Get a pressure tester and see that it is the cap and not the coolant reservoir. My guess is that it's the reservoir leaking from a hairline crack.

 

Thanks for the replies everyone. So far I can see a small trickle from the cap, will change the O rings on the cap and take it from there . Something I didn't mention was I topped up the oil the other day and found a few bubbles on the dipstick �� , oil looked clean and fresh though. Coolant loss and bubbles on the dipstick sounds worrying? Even though leaking from the cap? Anyone seen this before? Only has 74000 miles.

 

Check your again oil after letting the car sit undisturbed overnight.

Does your oil have any additives?

Bubbles are different from foam. Foaming can be a sign of overfilling. Don't worry about a small amount (one quart or less) of overfill. The issue is when oil becomes so foamed up that the oil pump pick up cannot get enough liquid oil to lubricate engine.

If coolant has seeped into crankcase because of leaking head gasket, or any other penetration, the oil will eventually become milky in color.