Clicking noise in right rear - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 11-01-2010, 07:18 PM
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jballentine jballentine is offline
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Clicking noise in right rear

I have 05 EXT today I ran to the store really quick and after about a minute I heard a clicking noise from the rear of the vehicle. It clicks 4-6 times and sounds like a winding then clicking again. It does it for about a minute then stops but after I turn the truck back on it starts doing it again. I peeked thru the slotted vents in the back and see electrical wires and a couple of black boxes really quick before I had to get into work I'm stumped anyone tell me what it could be that may oh had this problem and what it may be???
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  #2  
Old 11-01-2010, 07:19 PM
91RS 91RS is offline
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Does it have the air suspension?
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  #3  
Old 11-01-2010, 07:20 PM
WOOLUF1952 WOOLUF1952 is offline
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It's probably the mode door for the rear HVAC.
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  #4  
Old 11-01-2010, 07:32 PM
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No air ride suspension
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  #5  
Old 11-01-2010, 07:37 PM
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It's a failing recalibration process (broken or stripped plastic gears) on the airflow mode or temperature actuators or the rear HVAC. As WOOLUF says, it's most likely (from reports here) the airflow mode actuator.

If you're a DIY person, you can save hundreds of $$

Item #3 is the airflow mode actuator.

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  #6  
Old 11-01-2010, 08:48 PM
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Could I disconnect it for now till I can replace it? this is my long week on shift 5 12 hour days 7p-7a.
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  #7  
Old 11-01-2010, 10:07 PM
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Many members do that, yes.
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  #8  
Old 11-12-2010, 04:12 PM
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Can the actuators click when rear fuse #36 is pulled? We've got the out-of-control rear AC in the EXT, but I haven't had a chance to change the blower control module yet.
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  #9  
Old 11-15-2010, 08:29 PM
bleehan bleehan is offline
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my 2003 EXT passngr rear heater started "clicking" today but only when temp control knob is full cold (front or rear doesn't matter) is that an airflow mode actuator or temperature actuator, or should I replace both? thanks much


Bruce Leehan
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  #10  
Old 11-16-2010, 01:43 PM
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If the temp control knob affects the noise that suggests the temp actuator is the problem.
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