You wrote "you had it repaired"? Did you remove and re-install the hose?
It's possible there is air in there. Did you add any fluid? Did you lose any fluid when the hose was removed?
First, if the repair shop did the removal and re-installation, contact them with your problem...because it might be their problem.
If you did the removal and installation, remove the hose and look for an obstruction of any sort (shine a light through it). That fluid is coming out of the vent because the system is either overfilled or the fluid cannot return to the system (meaning some kind of restriction...which could even be too small an inside hose or fitting diameter).
If you have the original hose (I'm assuming you had a replacement made), compare it to the hose you had made.
If the replacement hose is correct, re-install it and make sure it's routed so there are no kinks or anything else that could obstruct the flow.