All the inline mod's I've seen have a lot more hose clamps, trimmed top fan covers, and that alone will take away from it being efficient. If someone would just make an OEM shaped aluminum housing that we could drop a chevy thermostat into I'd be happy, but out of all the D2's I've had or have once the thermostat was replaced to the 180F unit, along with the radiator, fan clutch, and fan blade (03-04 model) cooling issues with anything above 212F at the most extreme = are no longer an issue.

Heck the 04 I currently have with a new 180F thermostat in it runs so cool in fact I'm getting P0126 pending codes for the engine not warming up to spec quickly enough!

 

Taken Few minutes ago with 73degrees outside temp. 180 deg. Tstat

 

I've been doing quite a bit of towing lately with the Disco in 80-85* weather. Ill say that with her straining (I've had as much as 6500 lbs behind her) she scoots over 200 a hair, but just running around she stays in the high 180s/low 190s. I even forgot I turned my electric fan off (I replaced the factory mechanics fan with an electric fan) before I drove an hour round trip at one point and she never went over 200 even in town at stop lights. Didn't notice till I got home and the fan wasn't running when I cut the truck off.

The real weak spot in the system (once the inline mod has been done) is the radiator. It's too small once you get her with a heavy load in high ambient temps. When my epoxy patch job springs a leak I'm going for a Silverado radiator for a little more cooling ability.

 

I am currently contemplating the inline thermostat mod, however my temps at idle in SoCal usually never go above 197, with the A/C on its 194. I like the belief that I will get back the HP lost with running the vicious fan all the time and longer life for my head gaskets. I am currently running the 180 t-stat and I have a less than 2 year old radiator with pentofrost coolant. Would I benefit any from running this setup?

 

https://landroverclubvi.weebly.com/i...hermostat.html