Hey everyone, does anyone have any ideas on where a small water leak might be on a 5.0SC. I basically am loosing about 300ml every 4 weeks / 1000 miles. No signs of a leak anywhere, no error codes so don't think its an internal issue, guess it could be rad as its had to see the whole thing.


Are there any common areas people are aware of to check.

Any discolouration in header tank? Could get a sniff test done to check for gasses in the coolant? 1995 4.6 v8, green/tan (long gone)
2005 4.8iS X5, blue/black
2011 4.4 tdv8, black/black (gone)
2003 3.0d X5, Oxford green/black/manual
2021 p575 SVR, BR green/vintage tan

Water is normal anti freeze colour. I don't think there are any internal issues I think its just a small leak somewhere.

I had the same issue and it turned out to be the water (coolant) pump leaking.

Thanks, will go have a closer look at the water pump

I've had the same amount of water going missing, and then the top hose was cavitating when the engine cooled. I know mine is the 4.4 tdv8, different than yours, but I've just put a new expansion cap on and the hose is now ok and no water loss yet. Worth trying at £6 for the cap.

Hi Lighthouse.

Had a very testing time over the last few months with multiple small leaks similar issue to yours on my 5.0 S/C also. I would advise pulling the engine cover and undertrays off and getting in the gaps with some blue roll, a mirror on a stick and a torch. If you have a pressure tester put that on the expansion tank. Over the space of a couple of months I had 4 or 5 tiny leaks; a drip on the water pump hose but right around the back, which I originally thought was from the water pump seals. Also one from the two o-rings connecting the metal pipes which cross over the supercharger, this was so hard to see as it was dripping into the V in the block behind everything and evaporating, and I could smell it but not see it! Poor design on the connecting piece in my opinion. One on the bottom of the expansion tank and a tiny one from the bleed screw. Last one was the o-ring on the top rad hose. Glad to say they are all sorted now but boy did it test my patience.

I'm fairly local to you in Maldon if you ever want a second pair of eyes. Good luck.
Pete

Hey Pete

Thanks for the info, I will have a good look, planning on a full service this weekend and full brakes change so will have a proper look in those places.

I may well take you up on your offer.

Thanks

Kevin.

Mine is doing that as well. A camera showed it is the water pump and it’s leaking and leaving it in the V bottom. Still need to get it replaced 😂

I had a slight leak from my water pump on the old 4.4, intending to get it fixed. Then as I arrived at Meadowhall one day (80 miles from home) it went big style. Water was pouring out almost as quickly as I put it in.....
I would suggest fixing sooner rather than later  2017 Jaguar F Pace 25t Portfolio - still part of the JLR family 😀
2009 3.6 V8 (MY2010) - my first ever diesel! - now also gone
2004 4.4 V8 Petrol Vogue - now gone

So I've been chasing a coolant leak on my 2012 MY 5.0 S/C.

Using an endoscope style camera, I could see coolant under the supercharger just behind the coolant pump.

On removing the pump, I could see that one of the seals on the black pipe to the oil cooler looked squished, so I've replaced the black pipe and seals and reassembled with new pump gaskets.

Then tested and found that there was another leak from a joint on the block outlet tube.

Click image to enlarge