I’ve done the oil cooler btw so it’s not that. The UV dye is a great idea 👍

I had the same issue, although I resolved it with new pipes as I didn't know what size the o-ring was.

I wonder if we should compile a full list of o-rings used in the cooling system so a kit can be put together.

Chris. L405 - 4.4SDV8 Vogue
P38 - 4.6V8 HSE
Land Rover series IIA V8

Hi Chris, did the coolant find its way to the rear of the engine and down the bellhousing?

I am not sure where the coolant ended up. I knew I had a coolant leak, and upon investigation I could see it dropping from the bottom of one of those two front joints into the valley.

Chris. L405 - 4.4SDV8 Vogue
P38 - 4.6V8 HSE
Land Rover series IIA V8

I had the o-rings leak and I couldn’t find the smaller o-ring pipe sizing anywhere online, if anyone is wondering it was 19mm x 2.65mm

Great right up….the rubber seal size 45mm is that the internal size or external size ?
Thanks will

The 45mm is the id of the o-ring, and I’d suggest to do all 3 o-rings at the same time as I had one of the bigger ones leak and so I replaced both one of which looked like had been recently replace which wasn’t the one leaking and then was alright for a day then the smaller one in the middle started leaking.

yea makes sense what’s the size of the smaller seal

I used a 19mm x 2.65mm which I had in a viton o-ring kit which worked fine

Great thanks

Sorry to revive this…

Are both of those pipes into the thermostat the same size seals on the 4.4?

Thanks
David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Yes, the two large ones are the same size. 2012 Vogue TDV8 in Aintree green