:::Jerry:::: wrote:

Well I wouldn't go that far, but he shouldn't drop dead (in the dilutions
*normally* found in road going engines) !

Trouble is, you don't know what else might have been added or become
deposited into the coolant.

Chemists have been tasting stuff for hundreds of years, and until a few
decades ago it was perfectly normal lab practice. As long as you're
careful about how you taste things, transferring only tiny amounts to
your tongue, you are very unlikely to poison yourself.

Having said this, it's a crap way to test for antifreeze; unless you
know what coolant with and without antifreeze tastes like, it will tell
you nothing. The OP should just flush and refill with 40-50% antifreeze.
Takes no time, and is well worth doing.

--
Grunff