GMC Jimmy, S10, Blazer DIY How to Diagnose HVAC Mode Control - Vent - Defrost - Floor Selector

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This video should provide a starting point in trying to diagnose a GMC fan mode selection issue. My 2000 Blazer always blows air out of the dash vents. This video demonstrates how the vacuum actuators work to divert air from the vents to the footwells as well as to the defrost vent. In the next video, I will test the vacuum to ensure that I have sufficient vacuum to the actuators. Ultimately I believe that I'll have to replace the upper actuator, as I believe that it is faulty.

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Replacement Blend Door Actuators on Amazon - http://amzn.to/2EiD8sH
Blend Door Actuator Gear Rebuild Kit on Amazon - https://amzn.to/2N9IdpP

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Due to factors beyond the control of Mark Jenkins, I cannot guarantee against improper use or unauthorized modifications of this information. Mark Jenkins assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Mark Jenkins recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Mark Jenkins, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Mark Jenkins.