OK ..
I am going to guess that you are talking about the radiator hose... Does this said pipe connect to the radiator ...
Off memory, this pipe then feeds to the block, where the thermostat is housed, and this is by 2 bolts. It should have some sort of liquid gasket applied to it, when it gets sealed, so that would be the silicone stuff you are talking about.
Easy fix for yourself...
1 ) Get a new hose if it is frayed or not in good nick, and leaking.
2 ) Take the two bolts out from the circular piece of metal that connects to the block
3 ) Get a flat blade (razor blade) and scrape all the previous silicone off the block, and the piece you take off.
4 ) Make sure you get some good sealant on the freshly cleaned part.
5 ) Place it back on the block, and bolt it up finger tight. Do this evenly, so a couple of twists at 1 bolt, then a couple of twists of the other... Do this until you get it as tight as possible
6 ) Tighten with a ratchet and socket, in the same manner.
7 ) Put the radiator hose back on, and tighten as well.
8 ) At this point, it is probably a good idea to run the car without the radiator cap, and pump some revs... Topping up the water levels where needed ... This is to bleed any of the air out of the radiator system...
Problem solved...
It wouldn't hurt to check your bottom radiator hose while you are at it. Just dry up the mess and water from the other leak, take the car for a spin and see if any of the water has leaked...
If you took to a mechanic ... I would say the minimum they will charge you is about $100 ... I would say they would call it an hour labour + gasket goop... They may charge more and flush the whole radiator while at it, and then you will be also stung about $30 for coolant...
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