Last time I looked, the ETC sensor is below the thermostat, in the hot stuff.
If your heater is running full blast to warm up the cabin, that can be like a small radiator. Watch your temp gauge - the blower for the ECC should not come on until the needle has moved a little bit. My 1998 usually opened the thermostat in about 2 miles, no warm up idling, but from a garage at 40F. I found that the needle would drop a miniscule amount when the Tstat opened.
Are you sure that the thermostat is operating and not just stuck open?
Klaus
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Did you do your Random Act of Kindness today?
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