Graculus · Jul 12, 2024

Management are happy to carry out the repair - PM me for details of how to book it in, also let me know if you want to supply the parts (pipes & coolant) or you want us to do it. Clearly parts availability from JLR will determine dates.

L405AintreeGreen · Monday at 20:43

Graculus said:
... Unless of course it is item 1 above that is leaking... it does cross over the rear subframe but I've changed several, there is no need to completely remove the rear subframe, just the exhaust, OS front to rear under panel and lower the subframe rear on transmission jacks. Usually takes about 4.5 hours including coolant refill & bleeding.
The other possibility is to just blank off the two pipes that go to the rear if you're not worried about separate rear heating, the vent in the rear of the centre console will still operate, just the ones in the headlining over the rear doors and the ones at the side of the seats won't. You can turn off the rear heating to prevent it blowing cold air on the front screen climate settings, and of course, the rear aircon will still function if you turn it back on for summer.

Graculus thanks for sharing your valuable knowlegde on this subject! I and have a quick question as I’m looking to possibly blank off or bypass these pipes in the short term due to 2 separate leaks in the alloy pipes.
Forgive my ignorance but being feed and return pipes, does the hot coolant return from the heater matrix in the boot cooled? If not, I’m thinking to cut both pipes at the sill and attach a loop of 16mm coolant hose to bypass the entire rear system system.

Thanks

Graculus · Monday at 22:04

The coolant will have a lower temperature on the return, but you don't need to 'complete the circuit' - doing so may reduce the effectiveness of the front heater due to the flow being reduced, the rear heating will have a flow resistance due to the length of pipe run, if you bypass close to the engine bay, this resistance will be greatly reduced giving an easy path for the flow, rather than a higher resistance path through the front heat exchanger. In short, better to blank off (or use a restrictive loop) than simply link the flow & return in, or close to the engine bay.

Graculus

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L405AintreeGreen

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Graculus

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