Question about 1998 GMC Sierra
There is no air flow in passanger defrost or floor, drivers floor is weak but there... yet drivers defrost and all dash vents work good.... Please help, Wife says she's freezing!!!!
I assume you have the dual climate control feature on your truck. it sounds like you have door problems. The heating system has several doors inside the box and duct work that divert the air from defrost to face and feet...i'm not 100% sure if the ones in your truck are electronic or vaccum, but i think they are electronic. From time to time the actuators that control the door go out, as every electric motor does. You need to find the ones that have quit and replace them. It is possible that the arm(s) on the actuator(s) have broken loose from the doors and are working but not pushing or pulling the doors properly...if might help to remove the front seats...just to help save your back....working under the dash is hard on your body....and it take a good half day to remove the dash, so working under it is actually less work.
Posted on Mar 13, 2009
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Posted on Jan 02, 2017
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