If you have the XLT or extended wheel base, it's likely your HVAC actuator clicking which is where you're hearing the noise. It's located on the passenger side in the cargo area on the side. Pretty common to go out after the battery was disconnected for any reason.
I should guess it to be the electric fuel pump, although I thought those sounds had been eliminated by the manufacturers long ago. Perhaps you could raise the car in the air and get underneath it and see ( or I should say "hear")
That sound from the fuel pump should not mean it is bad or is going bad.
God bless your efforts.
SOURCE: 2001 Chevrolet Malibu...wont start?
I have a problem with my car where the build in theft system kicks on and I have to leave teh car in the on position for about 10 minutes turn it to the off position and then start it. You will see the theft light blinking and wait til it stops and disappears before trying to start it again.
SOURCE: 2004 Chevrolet TrailBlazer. Passenger front low beam headlamp out
FACE THE VEHICLE SO THAT BATTERY IS ON YOUR RIGHT;
2.REMOVE THE BLACK PLASTIC PIECE THAT RUNS OVER RADIATOR BETWEEN HOOD LATCH AND FAN. IT IS ABOUT 53 1/2" LONG AND HOLDS THE HOOD PROP CLIP. (3 PLASTIC PUSH RETAINERS & 2 SHEET METAL SCREWS);
3.REMOVE THE GRILL ASSEMBLY UNDERNEATH THE PIECE IN STEP 2 BY PUSHING DOWN FIRMLY ON 4 RETAINER CLIPS WHICH RUN ALONG THE TOP. USE A WIDE SLOT SCREWDRIVER. PULL UP GENTLY ON GRILL ASSEMBLY. IT WILL POP OUT. THE GRILL ASSEMBLY EXTENDS UNDER EACH HEADLIGHT ASSEMBLY (HA) AND IT DISPLAYS THE CHEVROLET LOGO IN THE MIDDLE. MY GRILL ASSEMBLY POPPED OUT EASILY AND ALL THE OTHER RETAINER CLIPS ON THE BOTTOM AND BENEATH AND TO THE SIDE OF HA WERE AUTOMATICALLY RELEASED WITHOUT ANY FUSS;
4.ON TOP OF HA SEE ONE TAB (ABOUT 1" LONG)ON THE RIGHT SIDE AND ONE ON THE LEFT (THE ONE ON L IS CLOSER TO THE FENDER);
5.PULLUPWARDDIRECTION ON TABS. THEY WILL SLIDE UPWARD A COUPLE OF INCHES AND WILL RELEASE THE HA WHICH YOU CAN THEN PULL OUT TOWARDS YOU;
6.AT BACK OF THE HA, REMOVE 2 ROUND RUBBER CAPS (ABOUT 4" IN DIAMETER)--ONE FOR LOW BEAM--ONE FOR HIGH. REVEAL BULBS. UNSNAP THE WIRE HARNESS FROM BULB BASE AND TURN BULB 1/4 TURN CLOCKWISE (REMEMBER YOU ARE FACING THE TRUCK)
7.REPLACE BULB(S). #9006 BULB IS GRAY-BASE, FOR HIGH BEAM ON OUTSIDE. #9005 IS BLACK-BASE, LOW BEAM TO INSIDE OF HIGH BEAM.
CHANGING HIGH AND LOW AND REASSEMBLY TOOK ABOUT HALF HOUR. GOOD LUCK.
ALTERNATIVE: IF YOU ARE REPLACING THE PASSENGERSIDE HEADLIGHT JUST REMOVE THE AIR FILTER COVER AND PULL PLUG OUR FROM BEHIND HEADLIGHT AND REPLACE. BE CAREFUL HANDLING LIGHT BULB. TO CHANGE THE ONE ON THE DRIVER'S SIDE JUST REACH IN FRONT OF THE BATTERY TO ACCESS THE PLUG AND HEADLILGHT. TOOK ABOUT 5 MINUTES. ENJOY YOU TRAILBLAZER, GREAT TRUCK.
SOURCE: 2004 chevy trailblazer ext. Clicking noise coming
Did you recently replace or disconnect the battery? Common problem is for the airflow actuators to go out and make that clicking sound in the rear when the battery is changed or disconnected.
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