Question about 2003 Chevrolet TrailBlazer

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I HAVE A LOUD CLICKING NOISE COMING FROM THE BACK RIGHT INSIDE MY 2003 CHEVY TRAILBLAZER. IT CLICKS 8 TIMES MISSES A CLICK AND THEN STARTS ALL OVER. IT CLICKS FASTER WHEN THE ENGINE IS RUNNING COMPARED TO WHEN THE KEY S IN ACCESSORY MODE.

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I am actually having the same issue... I found out that it is a small motor that controls the air flow of the rear ventilation system. It moves a flap to send air to the top or bottom vents, according to the desired settings in the dashboard. I am now trying to purchase this small motor online, but I have not been able to find its technical name.

Posted on Apr 25, 2010

  • Linda Austin Sep 22, 2011

    I have this same clicking noise but mine is coming from the front. It will click while in idle and then when driving for approx 10 minutes some time longer. Have taken it to 6 different mechanics and everyone of them have given me a different answer. I have had the vehicle for 6 years and it started back then. Have not had any issues with it though. So maybe not that important. Don't really know.

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Electric fuel pump by the fuel tank. It clicks slowly in "accessory mode" as it is just maintaining fuel pressure. When the engine is running the pump has to work harder (more quickly) because fuel is being consumed. The fast rate of clicking and the fact you can hear it clearly may indicate some fuel pump or fuel line issue. Generally these fuel pumps work on a solenoid principle. Contacts, when they click closed, charge the solenoid which induces a magnetic plunger to move back against spring pressure. When the plunger reaches the end (maximum displacement) the contacts are again clicked open, the solenoid discharges allowing the spring to now act unhindered to force the plunger back with a quantity of fuel. The pump by sucking and then alternately pushing fuel through a couple of crude flap valves pressurizes the fuel line to the engine.

Posted on Apr 24, 2010

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