No coolant leaking. What else could it be? Where is the Engine Coolant Temperature Sensor located?
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2006 Buick LaCrosse Question: My Lacrosse randomly over heats. The thermostat, head gaskets, fans, are fine
Answer #1PARTS GUY November 30, 2011, 19:43Master
Is the check engine light on?
Answer #2mastertech6371 November 30, 2011, 21:12Master
in the area of the thermostat. it is a 2 wire sensor.
from your description, I would change the thermostat, flush the system and make sure there is no coolant in the oil.
Answer #3ccsmog from Contra Costa Smog and Repair, November 30, 2011, 21:34Journeyman
I have to agree with ROY