Coolant % in a warm climate

[dodj]

You should have less than 300mV (.3 volts) in your coolant system. Test with a multimeter ground and one side dangling in the coolant.

How did you arrive at 300mV? Wouldn't it be different depending on the materials used in building the engine? Like an all iron engine be different from one with aluminium accessories?
Not doubting you, just find the voltage measurement idea interesting.

[autoxcuda]

You should have less than 300mV (.3 volts) in your coolant system. Test with a multimeter ground and one side dangling in the coolant.

How did you arrive at 300mV? Wouldn't it be different depending on the materials used in building the engine? Like an all iron engine be different from one with aluminium accessories?
Not doubting you, just find the voltage measurement idea interesting.

• Published trade tech research
  
• I've seen that number in new heater core boxes stating if you have over 300mV the warranty is void
  
• I've seen many dealer and independent mechanics use it

https://macsworldwide.wordpress.com/2010/10/01/how-to-test-for-electrolysis/amp/