The secondary air pump is located on the passenger side of the engine near the top sticking out of the side.
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
see "how too replace water pump on 2002 Trailblazer"
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
The 2004 Chevy Trailblazer is equipped with an oil pressure/sender switch that is just to the left of the distributor. It is in the front of the manifold. This device takes the place and function of the oil pump.
The torque of a water pump bolt can be requested from the manufacturer. The Chevy Trailblazer has a high torque for the water pump bolt.
Secondary air injection malfunction. Maybe the air pump failure or a leak?
In the fuel tank
The smog pump is located under the vehicle, on the drivers side, bolted to the frame rail, right under the drivers seat area
the air pump on 2005 trailblazer is located on the frame rail on the drivers side .by the drivers door
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it is located in the fuel tank
In 2004 Chevy moved the fuel filter from the drivers side frame rail and put it inside of the fuel tank. NOT KIDDING Keep in mind that a filter built into the pump is no longer considered a maintenance item.