Need help. Blend door 2007 Tahoe testing

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malvizar

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2007 Tahoe LTZ.

How do I know if my driver or passenger side is faulty, I'm getting COLD air when the HEATER is on, Through my front defroster. Also when AC is off, I get hot air through the front/face vents, on the driver side for sure, not sure if it's the same for passenger side. To the point I have to close the vents so the hot air won't blow on me.

AC works fine.

It's like the blend door is not closing.

Is there a way they can be tested before replaced? They're pretty pricey to just be swapping out, just because.

Thanks
 

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