Posted by wore out on April 26, 2021 at 09:57:21 from (64.255.159.199):
In Reply to: 2007 GMC heater AC? posted by Geo-TH,In on April 26, 2021 at 09:21:49:
No vacuum motors are used, it's all electric.
The sliders control 2 actuator motors/servos that operate a split blend door which can break or jam from debris such as pens dropping down the defrost vents.
Since neither side works there must be a common failure point between them, just one failed actuator wouldn't cause BOTH to stop working.
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