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Heater Clunk Noise

jljhlhl

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jljhlhl Enthusiast

jljhlhl

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Posted

Hi all,

 

I've recently encountered a problem with my truck. With the days getting colder going into winter, I've been using the heater in my truck and I've noticed a noise coming from in the dash when its on. Its not a very loud noise, but its got a clunk sound to it, and once it starts it just continues.

 

The thing is though, even if I have the fan control all the way off, but the temperature control on the heat, it makes the noise until I turn the temperature control to about the middle of the selector, just beginning to get into the cool temperature.

 

This is on a 2004 GMC Sierra with manual controls.

 

Any insight or past experience with this is greatly appreciated

jljhlhl Enthusiast

jljhlhl

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Posted

Just looked that up and that definitely looks like a high possibility of being the problem.

 

Sadly some things I read made it sound like it can be a pain to fix, so I guess for now I'll just turn the radio up haha. I'm still getting heat so I guess thats the main thing.

jljhlhl Enthusiast

jljhlhl

Posted
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Posted

I dont know that it would be something going on and off though, because once it starts it clunks fairly rapidly, like every second until I turn down the temperature control.

 

And yeah tell me about it. :thumbs: Every day it seems like I'm hearing a new noise comin from somewhere else!

jro909 Senior Enthusiast

jro909

Posted
Posted

my truck clunks with the a/c on(defrost) also if i stick my vents to defrost i get some noise from the doors, also if i put my truck on defog, shut the truck off and restart it, it moans until i move to a different air flow type

Starrman Enthusiast

Starrman

Posted
Posted
I dont know that it would be something going on and off though, because once it starts it clunks fairly rapidly, like every second until I turn down the temperature control.

 

And yeah tell me about it. :crazy: Every day it seems like I'm hearing a new noise comin from somewhere else!

 

a rapid click/clunk sounds like a sticking actuator. Mine does the same but not with the temp dial. It does it with the duct selector when I put it all the way to the left-most setting. If I move it clockwise 1 click it stops

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