I had my air-con checked yesterday. The technician told me that the problem is the "hydilap". i search the net and ask auto supplies about it but they do not know what it is. so i searched again in the internet and i am guessing it is the "idle-up vacuum pump". i'm really not sure about this but its the yellowish metal beside the carburetor. so again the technician told me it is defective, its power is not enough so he adjusted its screw to raise its power.
does this has anything to do with my poor aircon power? how about my high fuel consumption?
I just want to make it clear if i can buy a new one or should i try a surplus if there's any... Can anyone give me an idea on how much it would cost me?

I really need help. my aircon has been my problem many times i changed almost every part but i am not satisfied with the coolness... and this goes to my fuel consumption too... i spend too much changing, repairing carb, tune up, overhaul, tires, everything but still not enough. do you think this idle up maybe the culprit? thanks a lot and more power