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I have a 2003 4.2 L TB LTZ and I still don't know yet because I just spent a whole Saturday pulling the top hose and the engine water exit port. When I got the pipe off, I didn't find the thermostat. I bought a replacement thermostat that looked like the water exit port with the thermostat in it but the port shape was different. I'm taking it to my mechanic friend who told me where the thermostat was suppose to be and let him find it. I'm ticked.

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Q: How do you change a thermostat on 2004 ext trailblazer?
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