Yes. Otherwise you wouldnt have air conditioning in your vehicle.
On that truck you do not have an orifice tube but what you do have is called an expansion block or also known as an H-valve and there are two if you have a dual a/c system..........
The idle air control valve on a 2004 Trailblazer is located inside the coolant system. This valve regulates the air that comes into the cabin.
This front system uses an orifice tube which is located between the firewall and the engine. Remove the wiper cowl to access hex fitting on the evaporator inlet line. The rear system uses an an expansion valve which is located behind the driver side interior trim panel in the rear of the cabin.
You have to take the lower rad hose off. They stopped putting the drain valve on the systems after 2002. Try www.trailvoy.com for all the answers for your Trailblazer!
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No.
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If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.