I have a Jaguar XF 2010 that I bought in April this year. After 2 months I got low coolant warning. so i added coolant but after a short time it was again low so I took it to a mechanic. He found leak in water pump and replaced it. Unfortunately the level is still dropping though it has not given a warning sign. I don't see any leaks when I open the hood. How do I find out where it is leaking?

 

get a pressure tester.. if you don't see a leak after pressure testing it, then you have a bad intake gasket and you are leaking coolant into the engine. You can confirm this if you check our oil and it appears different than normal..milky or watery.

 

Pressure testers have instructions that explain how to use the tester to detect head gasket issues.

Tons of places to have a small leak in the Jaguar XF cooling system. There are plastic pipes and connections everywhere. There's even a plastic crossover at the back of the engine, on top of the plastic crossover in the front of the engine. The thermostat housing is external to the engine, like having your kidney mounted outside your body. And even the header tank is known to leak.

After 5 years, I just went ahead and replace every single piece of plastic, plus the water pump, so I didn't have to worry about it again for 5 more years.

 

I did that recently as well. Had to take the intake and S/C off to get to all of it. Replaced everything but the heater core crossover that is in the back. It looked good and not much heat generated back there since I have the V6 with two blanked cylinders ....hope I don't regret that decision ...lol

 

That pipe in the back is a real pain, but I wasn't going to go that far and leave it off no matter how much I tried to convince myself it wasn't going to fail.

Sure enough, another member on here had his fail recently in the same manner the front one fails.

It's the same weakly fused design of the front crossover, and it gets plenty hot back there. Maybe even hotter than the front crossover since it has the heat around the firewall from the exhaust and no direct cooling from the radiator fan like the front one enjoys.

Wonderful engine with a hideous design for the cooling system.

 

The good thing is that if you take the cowling off, it will give just enough room to get to that pipe if it ever goes out.

+1 ....even the service techs hate this cooling system design. I wish I could switch to the pre-facelift aluminium pipes, but that heater core crossover has always been plastic. Nice stable of cars btw...if you ever tracked or road raced, I have questions

 

Thanks! Where do I get the pressure tester? I am in Toronto, Canada.

 

do you have autozone or oreilleys there > or some version of those stores? They loan them out them. About $200 to use one of those things. Kinda high, but you get the money back

 

Agreed. Whoever decided that that was the best way of mounting the coolant pump needs their head examining. So many opportunities for failure.

I take it people have been able to source the rear crossover pipe reasonably easily? Last time I spoke to Jaguar they were not available.

PS as with most things, the equivalent Land Rover part is probably a lot cheaper: LR077042.

 

The tester and adapter set you need



And if its any V8 XF, the intake has to come off to change that rear crossover pipe.
Why do I know-- https://www.jaguarforums.com/forum/x...change-189069/