and i should probably also have an engineering degree if i intend to figure out the climate control system on my 91 RRC SWB. any help? it never seems to do the same thing twice, however i can somehow manage to regularly get hot air out of the defrost vents and cool air from the dash vents! i don't know how but.... i think one fan is not working at all and one works only on high also. please explain if you know. also if anyone has a good manual they'd like to part with let me know. one more thing, anyone know if all four of the U joints on this truck are the same? this part number......

Drivetrain, U-Joint for Driveshaft, Genuine


Part#: RNF411 Price: $69.00

thanks
mw