first off id like to say hiand hope this is in right spot well here gose .

i have a 1988 c 1500 reg cab no ac option just reg old heater and fan options .but recently i went to use my vents in dash and i get nothing. now i get air out of top of dash for defroster and for floor vent but nothing out of dash vents .


what do i need to check first to get this workinng agian ?


thanks in advance