Back to coolant issues again.

EEEHHHHHH!!@@##$%%^%^^&*(*&^^%$#

Have know idea what you are talking about.

Please explain
Regards
Rusty

As suffered this problem 7 months ago, and a bill of $700 because of a $15 globe, that simple.

Early signs maybe coolant loosing colour with maybe an odour,(in my case)
electrolysis (stray current) tends to go for soft metal,
ie; alloy radiator (ounce cleaned mine had 9 holes in it)
thermostate housing & other pipes of similar soft metal (alloy/copper)

Yes a multimeter is used, an analogue voltmeter is preferred that can measure millivolts the target is below 50mV or 0.05V 0.0volts is the best result.
CAUTION: If just replaced coolant, the coolant itself will generate a charge of which lasts approx 12 hrs

TO TEST is to have vehicle idling, at opperating temperature
place voltmeter neg to an earth or batt if close enough & pos in radiator water with no contact to anything else, and slowly go through each electrical item 1 at a time, if nothing comes to light try it on acc's & in the off position.

Happy hunting

On a lot of modern cars the radiator has an aluminium core but has plastic end tanks, effectively insulating the core, which can have consequences with stray current corosion. An easy fix which can prevent future problems as well is to use a bonding cable to earth the core to the body. A $2 job which can save hundreds later.. see ya