A/C & Heat question

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Sep 30, 2010 | 03:23 PM

MCDavis

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Joined: Sep 2010

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From: RVA

A/C & Heat question

Hey guys. Finally got some rain here this week, and the temps dropped a touch. I turned on the windshield defroster to remove the fog and heard a groaning/creaking noise.

I have manual controls. It was in the off position, I first adjusted the temp from cold, to a cold/heat mix (mostly cold though), then turned the fan dial to the defrost/feet setting. This is when I heard the groan/creak. It does the same thing when I turn the control back to off.

It wouldn't be the blend door as that wouldn't open and close with the on/off of the system, right?
I'm guessing that it's the "doors" that open and close the HVAC system. I didn't find a thread already, unless I searched the wrong keywords. Has anyone else experienced this? Should I be at all concerned?

BTW, the a/c and heat work as they should. Just have the noise for about 1.5-2 seconds when turning on and off.

Thanks!!

Sep 30, 2010 | 03:31 PM

jstnromero

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From: The Woodlands, TX

Mine does this too. I believe that it is the blend door. Mine does this from the on-off or the off-on positions accordingly. Apparently the cause is some of the foam gets stuck between the door and the wall of the chamber.

Sep 30, 2010 | 08:16 PM

bigunit54

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Quote:

Originally Posted by jstnromero

i got pertty much the same noise.

Oct 1, 2010 | 04:24 AM

svt2205

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Joined: Mar 2004

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From: Sunapee NH

I believe this is a very common problem. My 07 is very noisy. When the blend door fails, I'm buying a new truck. Stupid as it sounds, that's one repair that I'm not screwing with.

Oct 1, 2010 | 09:22 PM

Wilber15

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Joined: Nov 2001

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From: Duluth, MN

If you look on the heater casing next to the gas pedal, you will see a black actuator for the blend door w/ a white molded piece under it. there is a tsb stating to remove the blend door actuator and the mount under it. remove the white thing connecting both blend door rods and lube it up. The groan/creek is caused from lack of lube....