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Testing coolant with voltmeter
Goofing around in the garage I put the negative lead of a multimeter in the coolant, the positive clipped to a ground. Set the meter to the 20 volt range. It started with a reading of around 0.64 volts and as I watched it slowly ticked down to zero then ticked up in the negative range.
I disconnected the battery but got exactly the same results. I tried it with some of my other cars and got rock solid voltage readings, no ticking down. I plan to change coolant soon, but curious why it ticks down? Anyone else use a voltmeter to check coolant? What were your results? Is this a meaningful test of anything or just internet lore?
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1988 Silver 924-S Original owner Porsche 924S: The 944's cheaper, faster little sister. 
Last edited by 88Silver924S; 08-03-2016 at 05:26 PM.. |
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08-03-2016, 05:10 PM
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No..... LOL
Distilled water will not conduct electricity. However, once you start adding stuff to it like glycol and all the other things that make antifreeze, yeah, it will conduct just like most of the other water that covers most of the planet. I've never heard of using a voltmeter to check antifreeze. Only Specific Gravity.. |
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08-10-2016, 10:13 AM
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Join Date: Jul 2014
Posts: 405
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Well, here's some educational links fro using a multi-meter to test coolant:
http://www.intermotive.net/Tech%20Tip/Tech%20Tip%20-%20June.pdf Testing For Electrolysis Antifreeze is the lifeblood of your car's cooling system Cooling System Electrolysis Coolant Check | MotorWeek Sorry for some many links but I wanted to show that it is well founded. |
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08-10-2016, 11:14 AM
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The Red Car
New Project
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