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  1. #1
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    500e Battery Coolant

    Hey guys,

    I would like to top off my battery coolant to the Max marker. I went to the typical auto parts stores, Oreily and Autozone and I couldn't find the required OAT ms 12106 coolant. What are you guys using and where did you buy it from? Online? Dealer?

    Vince.

  2. #2
    Moderator map's Avatar
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    Mopar's OAT 12106 coolant. (See back label at top.)
    https://www.amazon.com/Mopar-Year-Mi.../dp/B017DP43ZC

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    Great thanks...Just ordered.

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    Let me add on to this thread with a question. When does the coolant turn on in heating mode or cooling mode? Is it only during charge, or on a temp sensor?
    Subaru BRAT EV project

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    Senior Member ElectricTireShredder's Avatar
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    It's on temperature sensors but also runs non-stop during all charging at any temp. It's not simple, but the end result is it seems to protect the battery very well:


    Fiat has two Thermal Management Systems (TMS) which are completely independent, at least very nearly - they seem to share radiator fans. One system is labeled "battery" only & includes a heater & also active chilling of the liquid by the A/C system. The other TMS is labeled "power electronics" so it is most likely what cools the motor too.

    There are multiple modes including coolant-pump-only, multi-speed radiator fans, & for the battery, heating & active A/C chilling.

    During L1 or L2 charging I can see my "power electronics" liquid flowing non-stop into the top of its reservoir, & OBD shows coolant pump 100%. When it's warmer the fans cycle from off to so slow that I can only tell by opening the hood to look. When it's above about 85F ambient, on L2 they cycle from off to so fast I can hear it easily with the hood shut.

    During more than 5 years of pretty close observation, I have never detected my 2013 500e activating A/C to cool the battery, even with 113F on the display after driving at high-power highway speeds, low-airflow city speeds, & then immediately L2 charging. Apparently the battery is most efficient at around 125F, so active chilling may be set to only come on somewhere near that, for maximum driving range. That's well above ideal longevity temperature though, & it might be nice to have a separate setting for charging, but either way our batteries seem to last quite well, with many high-mileage users reporting so little range loss it's virtually undetectable compared to a light headwind.

    Edit: 1st-gen eGolf seems to have great longevity even without liquid coolant, & I believe they have the same batteries as Fiat. If I was doing an EV project (like I just noticed the prior poster) I'd check what eGolf has. It might use a much simpler system of "just" cabin HVAC systems chilling/heating the batt compartment.
    Last edited by ElectricTireShredder; 12-28-2020 at 06:01 PM.

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    1.st gen Golf doesn’t have any cooling. But its batteries are different.
    BMW i3 first generation has the same cells.
    i confirm your observation about A/C not cooling battery during charging.
    I think it only engages when driving hard in summer and perhaps after long braking from high speed.
    Or it’s left over from the initial Bosch design with DC charging which Fiat finally dismissed before car launch.

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