So prob easiest way to test the coolant sensors while installed would be to buy a spare sensor connector w pigtail attached and connect multimeter to the wires? Have to find that connector, dealer parts dept may be easiest. Maybe amazon.Test them. If you don't want to remove them, at least test for continuity.
Morning cold engine here in the northeast at about 40 degrees, warm engine 200-225 approx.
my sensors are new but I'm interested in the test experience