Thermostat Replacement Trailblazer, Envoy 4.2 

The easier way to replace the thermostat on the 4.2 inline 6 2003-2009
Tools:
10mm 3/8 socket
10mm 3/8 swivel socket
Channel locks
24 inch 3/8 extension
3/8 ratchet (fine tooth recommended)
Use a worm gear hose clamp for hose connection to new thermostat outlet for ease of install.

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