The best way to identify your motor is to use the casting numbers on the drivers side rear of the block, behind the cylender head. The cylender head casting numbers may help too, they are located under the valve cover.
Try mortec.com
Under the radiator, passenger side.
The radiator drain plug on a 2003 Chevrolet Trailblazer is typically located at the bottom of the radiator, on the passenger side. Look for a small plastic or metal petcock that can be turned to release coolant. Ensure the engine is cool before attempting to drain the radiator to avoid burns or injury.
Near the radiator, passenger side. Two black plastic pins mount it to the radiator mounting bracket.
Remove the radiator cap from the coolant recovery jug that is located under the hood on the passenger's side.jd
The fuel pump relay is located on the radiator support bracket on the passenger side of the vehicle. It is the center relay.
The radiator drain on a 2004 Chevrolet Tahoe 5.3 is on the bottom of the radiator. It is on the right side and has a cover over it.
Just below the lower radiator hose.
It is located just below the lower radiator hose.
assuming you don't have a cap on the radiator, you pour it into the overflow bottle. on my 03 it's located on the passenger side of the engine compartment, against the firewall.
It is located just below the lower radiator hose.
It is located on the bottom right hand side of the radiator.