What makes you think the thermostat is not opening? I think that because you unplugged it, it triggered the light, but will go off eventually once it goes thru whatever drive cycle it may need to. Try unplugging the negative battery cable for a bout fifteen minutes and then see what happens, ecm, may need to do its component check again because it was unplugged, sensors I tell you.
Let me know what happens
jody
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Friday, May 28th, 2010 AT 7:45 AM