Disconnect the fluid lines completely and carefully run compressed air through them. You may just have a blockage that needs to be cleared. I say "completely" because you don't want to direct any such blockage to the nozzles on the hood, which might make the problem worse.
When you say no pump, does that mean there's no buzzing sound to suggest that it's working when you operate the relevant lever on the steering column? If so, recheck all of the related electrical connections, and the relevant fuse in the PDC.