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SamTheMan 05-16-2010 03:23 AM

Loud clicking noise when turning off heater/AC
On my 2005 Mustang GT, I noticed that nearly every time I turn the right Heater/AC knob (vent choice knob) from windshield, windshield/foot, or foot (so basically from right) to off, I get 4-5 very loud, fast clicking noises. There is no other problem with the car that I can feel or see and I cannot duplicate the sound every single time. But I would say it happens about 75% if the time.

If this is any help, it is possible the sounds started after installing an aftermarket head unit in the car (AVIC D3). I'm not positive it was due to the head unit, it just seems to be around the same time.

I am wondering if anyone else is having this problem and if there is any way to fix this.

Thanks in advance for any help.

SteveB_RET 05-16-2010 03:56 AM

Got a question for you.... Did the head unit have NAVI and did it come with a magnetic antenna that u stuck to the metal frame under the dash????? What you are hearing is a Mode Door Actuator and mine started making noise after installing my new Head unit also... It does not do it all of the time but I stuck the NAVI antenna under the dash and I am beginning to think that I stuck it close to an actuator and the magnetized antenna is causing the problem........

SamTheMan 05-17-2010 12:09 AM

Well it did come with navigation, but I routed the antenna to the back of the car. I'm only an amateur with cars and I have no idea what a actuator is, but what else could be cause it to make this noise? It is annoying to hear this noise every time I defrost the front windshield...

n406c 05-17-2010 01:47 AM

My car had the same problem but only when the key cycled. The noise is from a damaged HVAC actuator. Had 34k miles on it so it was covered by ford warranty.

SteveB_RET 05-17-2010 02:39 AM

SamTheMan, when you turn the knob from window defrost to floor or to the dash vents, vent doors open and close electronically. There are several inside the dash. One of them is making the noise.

VistaGT 05-17-2010 07:40 AM


SamTheMan 05-18-2010 08:11 AM

I appreciate all the help guys. I guess I'm gonna have to take it to the dealership.

thewarmachine 05-18-2010 08:41 AM

Had the same problem fixed at dealership recently. It was one of the blend doors.

gatkins94 05-18-2010 10:17 AM

Blend door actuator. I wish one of you guys would actually get the PART NUMBER when you get it replaced. I think there are 2 under the dash. One near the glove box, and one near the center of the dash....I'm guessing all the issues are with the center one, and that's the one that is messed up on mine, I just want to be able to go to the dealership with a part number.

n406c 05-19-2010 12:11 AM

Part Number

Here you Go =)

PHX8839 05-19-2010 09:41 AM

My car just started doing it. How much is the part and how much did you pay to get it fixed? I'll probably do it myself if I can.

gatkins94 05-19-2010 12:43 PM


Originally Posted by n406c (Post 7011077)
Part Number

Here you Go =)

Woohoo!!! Thanks!

boochy 05-19-2010 12:47 PM

What did it cost to get the actuator replaced?

boochy 05-19-2010 01:59 PM

Just took a video of this, mine is doing the same thing... Only happens when I turn the car on.

gatkins94 06-03-2010 03:20 PM

yep..same as mine. I have the part that the number above referenced to. It was about $20 I think....I haven't had a chance to take the dash out to replace it though, but will soon! It's annoying as crap!

157dB 06-03-2010 03:47 PM

Your blend door is jumping the rack and the clicking is the result.
It probably has a lighter or some other foreign object that entered
thru the dash vent(s).

geno87 10-12-2010 07:32 PM

Mine is doing the same thing. How hard is it to get to it? My happened after my warranty has expired.

gatkins94 11-30-2010 08:57 AM

I still haven't had a chance to take the dash out to fix this...the part just stares at me when I walk in the door.....I keep hoping someone else will do this, and take some pictures of how to replace it. I haven't done enough research on how to get to the part, so I'm hoping someone else has. I'll get it eventually.

azrampage 02-05-2011 06:20 PM

Blend Door Repairs
Apparently you don't need to pull the dash apart; access through the glove box or driver's side footwell.

There are three of these.

Found this but haven't tried it yet:


incorrigible 02-06-2011 09:38 AM

Look like a fairly easy fix to replace the blend door actuator if you can score the replacement part. There is known issue with the gear teeth breaking off causing what you describe. To verify it's the one in the post above, disconnect the connector and start up your car. If the noise is gone, that's the one.

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