My mom's runner is having an issue now :(

Stuck CAPS

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Well, I've searched (clearly I'd be a hypocrite if I didn't, lol), and from what I looked through, it was only slightly pertaining to this, most notably the clicking noise. However, with their's, it was only when the A/C was on, and other differences in reproducing those symptoms, etc.

I digress, so here's what's going on. She's got an '04 V8 Limited, with roughly 120k miles on it. When the air recirculator is turned ON, and she's at idle, there's a clicking noise. I dropped the glove box to check the blower motor, and it sounded to be coming from the general vicinity of it, but I'm still not sure as to EXACTLY what it is. The clicking stops when the air recirculator is switched off. When it's on, it stops when exceeding ~1800 RPM.

After testing it, and finding out those little tid-bits of information, I believe it could be something to do with the lid/cover thing that covers the cabin air filter when the air reciculator is on. I'm thinking it could be loose. My other thought is that it could be something on the motor catching only when it's closed. I've heard of that lid breaking when people replace their filter too... "Roughly," for lack of a better word. I'm just not exactly sure what's going on with it, and from what I know already, it's not a big deal if it's left that way, but I'd just like some info on what could be/is happening.

TL;DR: Clicking when air recirculator is on up until ~1800 RPM, which is when it stops. It'll also stop without the circulator on. Cover for the cabin air filter? Blower motor catching on something?
 
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Remove the cabin air filter cover, cover the opening off with duct tape or something. Does it make this noise while the vehicle is standing still or only when driving? Ambient temps make any difference? Does it matter what the temp setting is at? Fan speed?
 
I had a helicopter from a maple tree in mine that drove me crazy until I finally removed it. I figured it would go away with time, but after 3 months I finally had to pull it apart to remove it.
 
Only when still, and ill attempt without the filter tonight. Temps dont seem to cause any change, and the fan speed doesn't affect it, either which I found really weird.
 
Only when still, and ill attempt without the filter tonight. Temps dont seem to cause any change, and the fan speed doesn't affect it, either which I found really weird.

its nothing in the wheel then.

perhaps the actuator for the fresh air door?
are these electric, or vacuum?
 
You probably don't hear it very well after 1800 rpms?

The recirculation actuator has a sensor circuit built inside of it designed to let the motor know when it is open and closed. Mine is starting to fritz out so my motor just keeps trying to open, even though its already open. On my vehicle its a very soft clicking noise you wouldn't notice unless the A/C was on low and the radio turned off and you really listened. But I imagine it could get fairly loud in some cases.

Take the glove box off and have someone turn the HVAC on low and switch recirculation on and off, you should be able to hear the motor working and stopping; it shouldn't be running more than about 5 seconds
 
You probably don't hear it very well after 1800 rpms?

The recirculation actuator has a sensor circuit built inside of it designed to let the motor know when it is open and closed. Mine is starting to fritz out so my motor just keeps trying to open, even though its already open. On my vehicle its a very soft clicking noise you wouldn't notice unless the A/C was on low and the radio turned off and you really listened. But I imagine it could get fairly loud in some cases.

Take the glove box off and have someone turn the HVAC on low and switch recirculation on and off, you should be able to hear the motor working and stopping; it shouldn't be running more than about 5 seconds

Lol, I see this now after I came to a conclusion close to that. It's not that loud at all, though, so I'm not concerned.
 
They are called blend motors they go bad often in early 90s chevy and then Chrysler products new and old all day long. It's just annoying and doesn't do what it's supposed to. If you can see and reach it you might be able to replace it
 

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