Promedic
Posts: 41
Joined: Fri Jun 26, 2015 10:57 pm

Re: Tesla Branded g48 coolant?!!!!

I use BASF Glysantin G48, but I don´t know if it`s availible in the USA.
RAV4 EV 2012 Blizzard Pearl
(first RAV4 EV in the European Union)
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fred_dot_u
Posts: 27
Joined: Tue Dec 06, 2016 2:47 am

Re: Tesla Branded g48 coolant?!!!!

I've read quite a few posts that appear with the search g48 coolant, but none of them address the concentration. A local auto parts shop has the stuff, described as fifty-fifty but another shop of the same name has the full strength coolant.

Which one should be used in the HV battery reservoir? The DU reservoir is sitting at the top of the marks, while the HV pack is far too low.
2013 Rav4EV x 2
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asavage
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Re: Tesla Branded g48 coolant?!!!!

Generically, the difference between pre-mix and concentrate is convenience: with concentrate, you do your own mix-down, and you have to source your own DI water (I use distilled, because I stock it for other purposes, and it's readily available, but if you like DeIonized water, it can be had).

Personally, I buy and use concentrate, but pre-mix is more convenient (at a slight increase in cost). One thing you can't do with pre-mix is adjust concentration richer, which is something I used to frequently need to do when I flushed cooling systems, because all the old coolant (or flush water) does not leave the cooling system. With repeated fill/run/flush cycles, I could obtain a clear waste stream, but not a completely dry system. In that situation, being able to use a 40/60 (or whatever) water/coolant mix could get the overall system back to approximately 50/50.

The reason for 50/50? Less concentrate throws off the additive mix, and a weak mix can also raise the freezing point (and lower the boiling point), two of the goals of coolant in ICEs. Too much concentrate decreases pumping efficiency and heat transfer (among other things).

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Tony Williams has stated that coolant test strips that test the pH of the coolant can be used to determine coolant suitability, but I do not agree; that test methodology is valid for ICEs because they have specific coolant degradation patterns, which include accelerated pH decrease, primarily due to extensive dissimilar metals, thermal cycling well above what we have in our systems, and most importantly: pH decrease due to combustion gases leakage into the cooling system, which moves the pH down into the acidic range very effectively (same issue with pH in ICE lubricating oils, BTW, and the reason behind testing used engine oil for residual alkalinity . . . but I digress; Google "oil TBN" for more info.).

EV coolant isn't subject to the same stresses as ICE coolant, and test procedures should be different too. Personally, the stuff is cheap, and if the dealer doesn't gouge too much, I don't sweat it. I got my last coolant changes "free" due to warranty DU replacement @ 60k and warranty battery replacement @ 93k. I just turned over 106k, and I'm nowhere near 5 years since the battery change, so I'm OK for a while yet, and I've cheated and obtained a (hacked) Tesla Powertrain Diagnostic setup, so I can let it open the various valves and run the pumps while I change the coolant myself. It wasn't cheap, and is probably not worth the expense & hassle for most people, who just want to drive their car.

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I can't let this one slide . . .
jimbo69ny wrote: Wed Feb 13, 2019 3:09 am Neither one is going to corrode. You don’t have to bargain hunt but you can be an aware consumer. These two fluids are one molecule different. One is safe to drink the other is not. The only difference. They both do the same exact job.
One molecule different doesn't seem like much to you? Water (H20) and hydrogen peroxide (H2O2) have pretty different characteristics, too ;)

Arguing that "only one molecule different" makes something essentially equivalent for any particular use is groundless.
Last edited by asavage on Mon Aug 22, 2022 4:05 pm, edited 1 time in total.
Regards,
Al Savage
2014 Rav4 EV, Shoreline Blue Pearl, #2609, first use 04Jun2014, 49k miles (Aug2017), OpenEV-SE 40A. First DU replacement May2018 59k.
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fred_dot_u
Posts: 27
Joined: Tue Dec 06, 2016 2:47 am

Re: Tesla Branded g48 coolant?!!!!

Thank you for the timely reply. As part of the charger diagnosis, I discovered that the battery coolant reservoir was below Low. Your answer allowed me the confidence to purchase the 50/50 stuff moments ago and bring the levels to normal. The diagnosis revealed a pump related error and this may provide for a more certain resolution to that specific problem. It's not THE answer to the charging trouble, but may be the answer to the panic-inducing message on the dash while underway.

The problem with my wife's car is still under diagnosis, no certain solution/problem identified, but this minor incident also had me checking my Rav4EV to discover an equally low level.
2013 Rav4EV x 2
Emotorwerks 40A EVSE
plugshared
'03 Gizmo EV (for sale)
Focus Designs SBU 2100 miles! (for sale)
Airwheel S8 scooter
E-assist WAW velomobile (for sale)

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