Has anyone ever heard of a problem where the car’s cooling system – for example the radiator – is degraded due to electrolyis, and this condition is somehow connected with the radiator fan? I heard someone say this on the radio the other day. I’ve never heard of this. Apparently to diagnose this condition, you are supposed to measure the voltage between the coolant in the radiator and the car’s ground, and if it is more than a certain number of millivolts, then electrolysis may be occuring in the cooling system.
First of all, how could the voltage reading be anything other than zero? I mean the coolant is in contact with the engine, so it must already be at ground potential. And I don’t see how the radiator fan is connected to this. Isn’t the radiator fan usually electrically insulated from the metal parts of the radiator?
And what can be done about it? I mean should the millivolt reading excede the voltage specifications?
Just curious. Anyone ever run into this problem and could offer an explanation?