While driving, temp gage goes to 0 & ECT light comes on over 5-6 miles. no heat

What is your question?

Warms up normal, temp gage goes to middle in park & heater blows warm. Starts to drop while driving, on warm or cold days, down to 0 (?) or lowest on left side and red ect light comes on. Heater blows cold.. Restarting works, temp goes up a little, but goes back down when driving. Battery 2-3 years old. no obvious noises or observed leaks. been happening each day for last month.

What makes this problem better or worse?

If engine warms up, further to fall so it takes a little longer

How long has your 2011 Chrysler Town & Country had this problem?

About a month