Air Flow Issues...

[Nosferatu49534]

I'm trying to figure out why in my '99 tahoe there is little to no air movement coming out of the vents. I have looked at the motor that changes the damper position from floor, defrost and mid vents. It does seem to be working fine as it moves when you change the control position. The air flow is decent on the defrost and mid vent settings but the floor position I can barely feel anything. Just wondering is any one has any ideas/ suggestions as to what this could be. Thanks in advance.

 

[SunlitComet]

Perhaps the evaporator is clogged reducing airflow. Air moves thru it no matter what mode of operation or airflow direction you have set. or the ducting inside the dash has come loose.

 

[Nosferatu49534]

Will I need the take the dash apart to get to the evaporator? I'm ok with doing it. Just want to plan on the amount of time to leave my self.

 

[SunlitComet]

No. try cleaning doing this and see what happens. http://www.tahoeyukonforum.com/forum/showthread.php?t=29095&highlight=blow+a/c+cold

 

[Nosferatu49534]

Cool. I will check it out. Thanks.

 

[Nosferatu49534]

Looks pretty sweet. I will definitely be doing this as soon as possible.

 

[Nosferatu49534]

Well got to the evaporator. And it was spotless. Felt around and Maby a couple leaves in the bottom. I will have to just dig deeper in the dash. I'll update with what I find. Thanks for the suggestions so far though.

 

[SunlitComet]

On the mode motor on the left side of HVAC box above the gas pedal, it does move two separate door linkages correct?

 

[Nosferatu49534]

Yup. That was my first thought.

---------- Post added at 04:51 PM ---------- Previous post was at 03:45 PM ----------

I made a discovery while on my way home. There were some papers on my dash and even though my vent was on floor, most of the air was coming out of the defrost. So I'm assuming that the door is not in the correct position.

---------- Post added at 05:34 PM ---------- Previous post was at 04:51 PM ----------

And also I reread what u posted. I'm not sure on separate linkages. I'll have to check that.

 

[SunlitComet]

that motor above the gas pedal branches of to two separate visible linkages the move two separate doors inside the box. they are right along side each other.