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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    @SWUtah - I read this as coming from a guy across a bar, who happens to also own an LX and sharing experiences abt the truck. So the suggestions regarding fixing the problem are definitely welcome. The purpose of this thread is to serve as a repository for AHC info, so if you could help answer...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Real gold star suspension.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Thanks for uploading again. I’m familiar with this and read several times, and the language concerning “first time” and “second time” is confusing. All told, all four corners are supposed to be bled during a single “full flush” — as well as a fifth bleeder plug somewhere — is that correct?
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    No, different tech — and AHC was solid, corrosion commensurate with age, family truck with no wheeling history/damage/scars, and worked well until the moment I got the flush. Key point that guy stressed was to not fix anything that wasn’t broken — and that applied to the AHC specifically. I was...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    The conversation with the lead mechanic who worked on the suspension went OK. He said this is the first 200-series that he’s seen with a leaking globe, and that they’d need to take it in to examine further. I left the four take-off globe/actuators that I had bought off EBay two months ago for...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Yeah, just arrived at dealer and started the process now.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Yeah, my recollection is that it’s pressurized nitrogen that’s behind the bladder (chamber that’s away from where globe is mounted).
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Yeah, it’s Lexus of Memphis. I’m not faulting them for leaky globe just yet, but definitely for failure to perform a full flush as was expressly requested and discussed. Several other diagnostic pointers (maybe unique to my truck but I suspect are more generalizable): (1) dash and center...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Globe that is now leaking is driver-side rear — FWIW. Three others are dry. Prior to “flush” by dealer, no leaks and no performance issues.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    My AHC reservoir cap was not removed by dealer mechanics, which suggests fluid was sucked out/poured in through the tube sticking out of the AHC reservoir container (which does appear to have been moved). What’s the tool that would/could accomplish that?
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Yup, the old fluid (which I asked for sample of — and photo of which is up above on thread) was coffee colored (brown and clear). I tried to sniff the yellow, but couldn’t really ID it or get a good scent profile. BTW - echoing some earlier concerns, the AHC fluid is very toxic, so please be...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Ok, so here’s an update on the $330 dealer “flush” (the recommended 60K flush) I had the dealer perform bc service records didn’t have it, and it was an important item I wanted to benchmark and restore to as close to factory as possible. Dealer mechanics apparently did a “1 can flush” as opposed...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Thank you for clarification.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Maybe, but shaving two seconds out of about five is a 40% improvement, so that’s significant. Also, Toyota documentation (can’t remember if it was manual or some suspension-specific publication) said that at most, the lift from N to H should take about 15 seconds at most. Just wanted to share...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    FWIW — another performance benchmark following the dealer “AHC fluid flush” — the “kneeling” function (suspension dropping to Low when parking) now works in 3 seconds as opposed to 5, and seems smoother.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Here’s a slightly different 200-series AHC fluid flush technique, courtesy of @jenlain from a different thread.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Here’s another carry-over post from 100-series AHC, and hoping @PADDO can offer guidance as well on AHC performance and suggested maintenance.
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Another key 200-series AHC question: what’s the spec volume of AHC fluid that’s supposed to be circulating in the system at any given time (not just reservoir, but across the whole system)? In the 100-series it was about 5 liters (based on flush volumes that folks recorded) — is that correct...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Thank you for sharing this — the northernmost I’ve been in Alaska was 100 miles north of the Yukon River or thereabouts, in a late 90s Tacoma that was laughing at the washboard roads at 60mph speeds. My dream is to return in the LX, and get as far as the North Slope/Arctic. In summer, AK temps...
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    LX570 AHC “Basics” - Added as sticky thread for AHC Issues

    Don’t be haters. “Smell tests,” “knock tests,” “sway tests” — which seem subjective and voodoo to most outside observers — are at the heart of automotive diagnostic work. Next time you see a long range truck driver beating trailer tires with a baseball bat, you should maybe take a listen. Andy...
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