Vents not changing?

TSWIDLER

MEMBER
2002 FORD TAURUS
6 CYL
2WD
AUTOMATIC
70,000 MILES

I have an automatic AC/heater system. This problem is unfortunately intermittent. It is a problem with both air condition and heating. The blower motor works and the fan speed increases correctly when a higher temperature for heat or a lower temperature for air condition is selected. The air condition compressor also feels correctly cold when engaged. The issue is I feel only room temperature and I don't think the cold in case of air condition or the heat in case of heating is getting to me. Again that is not always the case. Turning of and on the engine a couple times can sometimes fix the problem. When it then works I hear a plop as if a door opens. Any idea where I should focus my attention?

5 Replies

RACEFAN966

MECHANIC
5,029 POSTS

Ok it sounds like I would look at the blend door or blend door motor. Here is a pic of both they are both available at you local parts stores once you know which is bad, I would suspect the blend door motor.

Blend Door Motor

Blend Door

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Thursday, October 21st, 2010 AT 9:54 PM

TSWIDLER

MEMBER
4 POSTS

Thank you. Where are those parts located? Also do you still think it is those parts when I observed it to happen more often when there is a difference in temperature between the outside and inside. Outside is cold but inside is warm due to sun.

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Thursday, October 21st, 2010 AT 11:13 PM

TSWIDLER

MEMBER
4 POSTS

BTW there is and was no diagnostic error code!

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Thursday, October 21st, 2010 AT 11:31 PM

RACEFAN966

MECHANIC
5,029 POSTS

Ok there will be no trouble code with this kind of problem. Now as for the location I will include a pic. I suspect the pop you hear is the motor when you are in there look for anything that fell in the vent and is stuck in door it could be something that simple otherwise the blend door motor would be my suspicion without being there to check myself. If you need me to clear anything up for you ask ok. It is behind the glove box area, you may have to remove the glove box but that should be it. If you more just let me know.