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Discussion Starter #1
I just finished installing a new coolant expansion tank on my 08 LR3 because the original tank's float stopped floating thus sending a false low coolant warning to the car's message center. I pinched off the hoses to the old expansion tank before disconnecting and refilled the new tank before reopening the hoses so there shouldn't have been any air introduced into the system as a result of the swap.
My question is, what exactly is that bleeder screw on the expansion tank for and should I be using it to bleed the new tank?
Tanks in advance! :wink
 

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On page 3 of the maintenance manual (Cooling System Draining, Filling and Bleeding (26.10.01)) they claim you open it when refilling after an engine coolant drain. We only left the filler cap off and kept squeezing the hoses until all the air was gone, never touched the bleed screw. That was on a 2007 LR3 4.0L V6, yours may be different...
 

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Discussion Starter #3
I’ve left it alone. The plastic screw set in plastic threads is worrisome to me given it’s a pressurized system. I agree with the cap off the bleeder serves no purpose.
 

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If it's a 2008 you are right on the cusp of that plastic bleeder screw literally deteriorating and falling apart. Mine did two years ago (2006 LR3) and parts of the plastic screw went into the coolant hoses and I needed to replace hoses too (couldn't get the plastic out!). I ended up going to Home Depot and making my own but it ended up being too big and I stretched the hoses. Then I just bought this instead: -new LR3 cooling bleed, metal 10mm Tee fitting upgrade

Replace it soon, because it WILL eventually fail and leave you on the side of the road scratching your head at one point, until you take off the plastic engine cover and see coolant sprayed all over on the underside of it (and all over the engine).

91516


91517
 
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