A.I.R. Problem with my 2001 Chevy Blazer 4.3L V6 Vortec.
Dash lights = service engine
secondary air injection
Replaced fuel pump,fuel filter,plugs wires cap.

Question =
what is secondary air injection. Why does my truck have it.

JK
Secondary Air Injection is an emissions system that pumps air into the exhaust system at the proper
time to help the catalytic converter function more efficiently. A common failure on that truck is that
the pump has sucked up water/snow/ice and has failed. This will also blow the fuse(s).

The fuses are in a little fuse block stuck down between the fender and the battery. A black cover
over the block, a little hard to see. First check those fuses, i would you will find a blown fuse. If so,
you will have to replace the A.I.R. Pump. There is also a service bulletin for this problem. It involves
installing new pump, and hose assembly to prevent water from being sucked into it
A few other Chevy questions.


2003 Chevy Trailblazer 4.2L inline 6 cylinder.
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.

JK:
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
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What Is The Secondary Air Injection System?