Review on ACDelco GM Original Equipment 15-11006: Engine Coolant Thermostat & Housing Assembly – Efficient Performance and Durability by Eddie Rivas

Unlike the part in the picture this is the correct thermostat for the 4.2 Trailblazer. The one in the picture has a lot of creases in the fold and just doesn't look right. Rest assured that the part you receive is the correct shape and is a genuine ACDelco part. For reference the ACDelco part number is 15-11006 and the GM part number is 12620112, as you can see in the pictures the numbers are molded into the part itself. It's made by Behr, the GM OEM/manufacturer for this part (as well as the fan clutch). A new O-ring is screwed onto the thermostat. I have attached photos for reference if you need them.