I changed the fuel filter on my Dodge Laramie 3500 5.9 Cummins diesel and now suddenly my vents don’t blow but the ac blows cold at the defroster. The internet is leading me to believe it could be a vacuum line leak near the firewall which is close to where I changed the fuel filter. I know it could be blend door actuator but it’s mighty coincidental that my vents stopped blowing right when I changed the fuel filter. Please help if you can.
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