Looking for a "how To" on replacing coolant hoses but haven't been able to find anything here. My "11 LS with 72k miles is ready I suppose.

 

I have done coolant hoses, I replaced all of them - not just radiator hoses but all small ones around the thermostat, HVAC heat exchanger (in the engine bay) and the throttle body. I also replaced all clamps just in case along with the transmission lines + clamps. It is very straightforward, it does help to have clamp pliers and hose pliers. Be careful around the radiator as it tends to break easily.

 

Thanks... OEM hoses?

Oh, and what about ridding any air in the the coolant system afterwards. Any problems there?

 

Yes, I went with OEM because old lines lasted for 10 years in New York/New England weather. I did not have any leaks, it was preventive. Interestingly, some OEM hoses need to be cut to length.

There is a purging plug (internal hex) on the top of the radiator. Remove the plug, fill the overflow tank with coolant up to the full mark and start the car. Make sure the system never goes empty by adding more coolant into the overflow tank when necessary. Once the system is free of air, coolant will start coming out the purging plug. There should be no bubbles. Reinstall the plug. At this point there should be no air in the cooling system. However, I loosened (without removing) the plug couple times after the car was running for a while just in case. I had no bubbles.

Caution! Do not strip the plug, it is plastic and very easy to over tighten.

 

Many thanks…

 

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Hi, Anfanger. I replaced all coolant hoses last weekend, including the heater core hoses. I used all OE hoses, along with a new thermostat. All went well, except for the small overflow hose that connects the coolant reservoir tank and the radiator (the small connector that is easily broken). The part number is 16567-38011. Somehow, the diameter of the new overflow hose to the radiator connector is bigger than my old overflow hose. I double-checked several online OE suppliers and the part number is 16567-38011. By reading the diagrams on dealer's part website, it seems to me that the dealer shipped me a 16567-38010 overflow hose for LS600 which has a 20mm outside diameter at the connecting point to the radiator, which didn't match my 2008 LS460 overflow hose that has a 16mm outside diameter at the connecting end towards the radiator. I spoke with the dealer rep and he agreed with me that they shipped me a 16567-38010 overflow hose by mistake, and he was kind enough to order me a new 16567-38011 overflow hose. To my surprise, the new 16567-38011 overflow hose still has 20mm outside diameter at the end that connects to the radiator, which is bigger than my original overflow's outside diameter. I am sure it will cause a leak if I install it, since the hose inside diameter is much bigger than the radiator connector. I'm wondering if you noticed if your new overflow hose 16567-38011 had a bigger outside diameter at the end that connects to the radiator than your original overflow hose . Did anyone else experience this problem?
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Two other questions:

Do I need to drain any coolant before removing hoses to prevent a mess in my garage;

Anyone have hose part nos. handy (invoice maybe)?

 

There are, at least, 2 different types of hoses - type A and B. It is related to the original and updated radiator designs. The new design has a larger diameter nipple which addresses the known issue. If your car came with the original style radiator, parts found by the VIN number should give correct part numbers but there are exceptions.

In my case, I got the original design hose, however, I had an updated radiator installed days before that. I had to reorder the hose again. I got a correct part number the second time. You need to press the dealer to get the correct part number.

 

Yes, you need to drain the radiator. There is a drain valve at the bottom of the radiator. If you do not, you will have a lot of cleaning to do. There is no need to drain coolant from the engine (there is going to be some left) unless you flushing the coolant.

Radiator hose #1 (RWD) - 16571-38050 (required: 1)
Radiator hose #1 (AWD) - 16571-38060 (required: 1)
Radiator hose #2 (RWD) - 16572-38100 (required: 1)
Radiator hose #2 (AWD) - 16572-38110 (required: 1)
Radiator hose clamp - 90466-A0024 (required: 4)
Engine coolant hose - 16282-38060 (required 1)
Engine coolant hose clamp - 96136-41501 (required 2)
Hose - 99556-30100 (required: 1)
Hose clamp - 99556-30100 (required: 2)
Engine coolant hose - 16267-38030 (required: 1)
Hose clamp - 96136-42501 (required: 2)
Engine hose - 99556-30100 (required: 1)
Hose clamp - 96136-42501 (required: 4)
Engine coolant hose - 16281-38090 (required: 1)
Engine coolant overflow hose (RWD) - 16566-38010 (required: 1)
Engine coolant overflow hose (AWD) - 16566-38020 (required: 1)
Engine coolant overflow hose clamp (Type A) - 90467-13054 (required: 2)
or
Engine coolant overflow hose clamp (Type A) - 96135-51300 (required: 2)
Engine coolant overflow hose clamp (Type B) - 96137-41501(required: 2)
Engine coolant overflow hose (Type A) - 16567-38010 (required: 1)
Engine coolant overflow hose clamp (Type A) - 90467-16037 (required: 2)
Engine coolant overflow hose (Type B) - 16567-38011 (required: 1)
Engine coolant overflow hose clamp (Type B) - 90466-A0018 (required: 2)

Please, verify all parts numbers against your VIN. There is a chance I might have skipped some, there are just so many.

 

You da man!

 

Many thanks Anfanger, great info for future reference!

 

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Thank you, Anfanger, for the good information. It looks that I'll need to re-order the overflow hose and get the original diameter to match my radiator connector's diameter.
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Update:
Longo Lexus parts manager, Gabriel Perez, helped me identify the correct overflow hose that fits my radiator nipple connector. The part number is: 16567-38010. I replaced my old radiator nipple overflow hose this weekend and it was a direct fit. So, if your LS460 has the original radiator or if your replacement radiator has the same overflow nipple connector diameter as the original radiator, the correct part number is: engine coolant overflow hose (Type A) - 16567-38010. Special thanks to Longo Lexus parts manager Gabriel Perez, who identified the correct overflow hose for my radiator and graciously shipped it to me even though I had the wrong overflow hose in my possession for more than six months. Also thank Anfanger for providing all the relevant cooling hose part numbers.
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