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Hi i have a 1991 Chevy Silverado C/1500 extended cab.... i try to get my truck heated but i keep getting this on my digital reader on my controls http://www.gmfullsize.com/forum/attachment.php?attachmentid=15132&stc=1&d=1417494057

and i also hear a knocking on the passenger side under the dash when i turn the key to the on position without running the truck. i was wondering if anyone has encountered this problem and what you did with possible pictures, ive been looking with no luck, dont know what the difference from manual or auto actuator, i have to push the the rectangle button mutiple times to switch from heat to cold when it does work. need help winter is coming!

Thank you, Logan G.
91 Silverado
 

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