Checking the condition of your coolant with a multimeter
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Thread: Checking the condition of your coolant with a multimeter

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    jgayman's Avatar
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    Checking the condition of your coolant with a multimeter

    Messick's posted an interesting video today showing how to test the condition of your coolant using a multimeter. I had never heard of this method before so I did a few Google searches and sure enough, voltage in the coolant is a thing. :-)

    Cool Trick. Check coolant quality with your multimeter! - YouTube
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    coaltrain's Avatar
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    Pretty neat. Makes sense what he says to me.

    Iíve had a hydrometer (?) for many years but havenít used it in a long time. I change the coolant in my tractor and wifeís car on a scheduled basis (both diesels) and just hope my truck is OK as it doesnít call for a coolant change until 90k miles which it will never see in my ownership.

    I love his 3 minute videos. I just canít watch a 20 minute video where the guy basically says nothing.

    Iíll have to go check up on their videos this afternoon - havenít watched any since last summer.
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    John Deere 1025R TLB's Avatar
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    Quote Originally Posted by coaltrain View Post
    Pretty neat. Makes sense what he says to me.

    Iíve had a hydrometer (?) for many years but havenít used it in a long time. I change the coolant in my tractor and wifeís car on a scheduled basis (both diesels) and just hope my truck is OK as it doesnít call for a coolant change until 90k miles which it will never see in my ownership.

    I love his 3 minute videos. I just canít watch a 20 minute video where the guy basically says nothing.

    Iíll have to go check up on their videos this afternoon - havenít watched any since last summer.
    So is it good with the higher voltage of 2.4 volts or bad with the 0.4 volts? Or vice versa? I could not watch and listen.

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    jgayman's Avatar
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    Quote Originally Posted by John Deere 1025R TLB View Post
    So is it good with the higher voltage of 2.4 volts or bad with the 0.4 volts? Or vice versa? I could not watch and listen.

    Sent from my SM-N910V using Tapatalk
    It should be less than 0.40 volts (400 mV). He misread the meter when he said 2.4 volts, it was actually reading 0.024 volts.
    Last edited by jgayman; 02-18-2019 at 07:57 PM.
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