How to test your coolant with a multimeter
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- Опубликовано: 13 сен 2024
- Did you know that your coolant can be damaging your engine, even if it test ok with a specific gravity tester or test strip? Here I explain how and show you how to test it easily using a meter.
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Hello Hello. There are all different recommend test voltage cut offs .20 , .30 , .40 and all different "methods" with different results. Some say engine on , some say off, some say POS in coolant some say NEG in coolant. Here are my sample results that may help some viewers . POSITIVE in coolant .20 v (engine OFF) .24 v (ON). NEGATIVE in coolant .26 v (OFF) .29 V (ON). Those are big differences. AND IF SOMEONE HAS THE CORRECT VOLTAGE CUT OFF AND CORRECT METHOD PLEASE LET US KNOW. THANKS!!
It would be very helpful to show the voltage with new coolant to confirm an improvement and set a baseline. Good video.
I may have to try this just for no reason.
I check mine by look, smell, and boiling point (Tester). And, I only use 100% Peak for my vehicle(GM), mixed 50/50 with distilled water. And, ya gotta burp that baby!
Hi Mr. B. I've done my testing with Fluke multimeter. My first dip into the coolant showed 0.190vdc and when I kept the probe long enough the value went down to 0.022vdc. Which measurement should I take? The first dip value or the prolonged dip value???
I would take the first measurement. Thanks for watching!
@@AutoScholarwithMrB Thanks for the reply. Cheers!!
Very interesting , ,what is the rationale for arrive at this threshold? I take it that is has something to do with electrolytes in the fluid that gives conductance
Honestly that’s just the spec, I would guess that it has to do with ionic transfer. More of a physic/chemical engineering issue, and that’s way over my lowly pay grade, ha ha! Thanks for watching 66!
You do not need this.
Measuring the voltage potential of the coolant is not a reliable method in determining the health and condition of the coolant. Voltage potential can certainly indicate galvanic corrosion, but there are many factors that affect the measured voltage potential such as the concentration of water and coolant mix, type of coolant, contamination, and where you poke the ground lead to.
A visual inspection is usually adequate enough for indications of coolant degradation and contamination.
- Discolouration can indicate either contamination or degradation
- Cloudy or murky coolant are signs of contamination
A pH test can also indicate any coolant degradation.
Look at your owner's manual or ask someone in the parts store for the correct coolant for your vehicle.
I see many are making a mistake on the decimal place, they're not considering the difference between volts and milivolts
Im confused too some said red in coolant some said red to ground which is which? Damn lol
@@abdulmuhaiminabdullah6965 Normal is the black goes to the ground same as the black cable goes to the negative on the car's battery which is connected to the car's ground, frame. But technically if you place the test meter's red lead onto the ground the meter will show a negaitve volts such as -0.02 vDC as opposed to 0.02 vDC. The #'s are the same only one is a negative reading and the other is a positive reading. Best to go with the standard way the car is wired which is black to ground / negative and red cables, leads to positive (coolant in this test). See the colour of the cables connected to the car's battery for reference.
Thank you man
About to go try this on my GLI !
Let us know how it goes, and thanks for watching
Negative on the ground or on the battery negative terminal
Thank u so much.. just got the EEDM525F
That’s a fantastic meter. We have about 30 of them and the students cannot break them.
Should have shown after the new coolant was in. Also I was taught to tach up to 2k rpm and under 0.4volts good 0.5 and above bad. ??
I thought we want to measure resistance of brake fluid to check water percentage. 3% or higher and fluid needs to be changed. 3% is about 5M Ohms. Lower reading is worse and higher means brake fluid is still good.
I own a lexus Rx450h the battery is located in the trunk , can’t do the test? Its an hybrid car.
You can put the lead on the 12 volt jump point under the hood if your car has one.
@@AutoScholarwithMrB Ok just done it with a ground near the chassis , i found 57mVolts, 0.057 volt
A instructor at school mentioned that the ground goes to ground and the positive into the coolant… Does it matter ??
As long as the brake system is grounded to the chassis, no. Checking resistance from the battery ground to the master cylinder should show continuity if the brake system is grounded.
Mine is reads 0.01v is that ok?
Should be fine
Should the engine be cold or warm ???
Engine should be cold, for safety.
Tested coolant on a JD small tractor . Showed 11.7V .. not millivolts but for blown volts 😂😂😂
Why don’t you do a test on a fresh gallon of coolant so we can see the difference? Guys stop believing those none sense video please
How would I even fake this? Lol, not everything is a conspiracy.
I tend to agree with you Evans, it doesnt make sense.
@@AutoScholarwithMrB do it on fresh and compare. Why wouldnt a simple ohms test tell us? set it to ohms and put both probes in the coolant.