Relay Cycling - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 07-09-2019, 10:29 AM
Jerry R Jerry R is offline
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Relay Cycling

Hey Y'all,
Jerry here.

I own a 2003 Trailblazer EXT and have a condition of a clicking sound under the right side rear trim cover after the vehicle is started. Not all the time, but most.
It is activated by a solenoid being cycled in the fuse panel by something. I stops after a while but think the situation needs to be rectified.
Any thoughts as to what could be cycling the relay?
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  #2  
Old 07-09-2019, 12:01 PM
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TB-Al TB-Al is offline
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2007 Chevy TrailBlazer LS
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How many clicks? The BCM computer tests the integrity of the fuel system by opening and closing solenoids on the fuel tank vents a couple of minutes after starting. Takes less than 10 seconds as I recall.
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Old 07-09-2019, 01:10 PM
Jerry R Jerry R is offline
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It Veries

Most of the time it will be a steady almost 2 times a second for 20 to 30 seconds and other times it is a rhythmic 1,2,3 pause, 1,2,3 for approx. same duration.
I like your quote, William!
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Old 07-09-2019, 05:16 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
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That noise is one of the two actuators in the rear HVAC system, when they click like that, it means that the gears are worn out or broken. The rear HVAC is located behind a panel in the passenger side of the cargo area.
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Old 07-10-2019, 12:04 PM
Jerry R Jerry R is offline
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Talking Thank you. Sounds like you got it.

Sorry guys. I am learning the site and did not realize this is the Intro Thread (I hope).
No more tech questions.

I am an 82 year old retired Industrial Construction Field Engineer living in South Carolina and am the owner of a 2003 Trailblazer EXT. looking for help on answering some questions I may have on same.Looks like this may be the place.
I am presently having the worn out front suspension replaced (hope it is a wise decision) to make it a vehicle that will last me until I drive on the Great Autobon in the sky . Have a Pull a Part close by for a source of the little things.

Thank you guys in advance.
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