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2004 GMC Sonoma SLS Crew Cab 123 WB 4WD

2004 GMC Sonoma
Trim Info:
4-Wheel Drive, Crew Cab 4.7' Fleetside SLS
15 mpg city / 19 mpg hwy
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August 26, 2012, 1:47 pm

Travis K
 

Question: Where is the blend door located?

When i turn the blower on in my 2002 GMC sonomo, the first and second speeds do not work, the third and fourth do, but nothing comes out of the vents, floor, or defrost, and it makes a whistle noise. My thoughts are that the air is blowing through, but is being cut off and the air is what the whistle is(like blowing into a bottle from the side). I would like to start checking what it could be, rather than be charged by the hour just to look around. I thought Id start with the blend door, but i cant find its location.


September 9, 2012, 9:02 pm

Elizabeth K
Expert Mechanic

Here is some info on the blend door:
http://www.s10forum.com/forum/f107/a-c-blend-door-actuator-476097/

If the 1st and 2nd speeds of the blower motor don't work, you may want to check the blower motor resistor.


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