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I am the one that helped you with the air bag issue and sent you a message on that.
Normally the hydraulic fan will use a wax type valve that heats up and allows the fluid to flow through it at a certain rate and will allow the fan to spin, the other way is with a fan controller . IF you have the fan controller it would be mounted near the radiator shroud and have a plug going to it, many times if you pull the plug to it the fan will default to high speed, so that would be something to try if it is not spinning and you have that, I am unsure because this is an older unit. IF they replaced the hose and the wax valve was full of air I suppose it would be possible for it to stop working, could also be a bad fan, putting the wrong fluid in etc.... I have to run out on a call and will respond when I get back if needed.... Please keep in mind that we only get credit when you select a rating, I saw on the air bag question you never did and my answer seemed to help... Robert
Was just checking in to see if my answer was helpful ???