Chevy Trailblazer Dash Vents Not Working
2003 Chevy Trailblazer Vortec. Battery replacement. I tried pulling the HVACB and HVAC1 fuses. Left for a minute and started the engine left for 2 minutes. Turned off engine. Turned it back on and tried to see if it would work and it didn't. Dash vents will not work. Manual system.
I would disconnect the negative battery cable for 10 minutes, then do the procedure you have tried again. If that does not help, you may have a problem in the a/c control head. Replacing battery can sometimes do bad things to electronics, especially if not done properly. Re-learning the door positions can also be done with the dealer scanner. This re-home is better than just removing power from the system. And, you may end up there anyway to have the system properly diagnosed.
need to know where the vent solenoids are located. That's one of the possible problem. Chevy Trailblazer LS 2006. Warning lights = engine, oil light. Computer\ codes = P0449. Repairs: changed spark plugs, changed oil and filter. Looking around Internet for a picture of a part.
P0449 on your Trailblazer is usually the EVAP vent solenoid. But have had a few that were a wiring problem under the hood of the 4.2L V6. To be sure you need to have a scanner that can control the solenoid on and off. Then have a test light in the 2 wires at the solenoid and make sure it lights up. If not, you have a wiring problem.
Under the hood in the main engine harness that is below the computer (PCM) is where I have found a few broken. Either the power or the ground circuit to the vent solenoid. If the vent is bad, it is located at the rear of the fuel tank on a bracket. It has one electrical connector and a large vent tube on it. Sort of between the drive shaft and tank.