2002 Pontiac Bonneville leaking anti-freeze?

I have a 2002 pontiac bonneville SLE that is leaking anti-freeze from something just below that alternator. Can someone tell me what is just bellow the alternator that would allow anti-freeze to leak out ONLY WHEN THE ENGINE COOLS DOWN??
 
If that is the source of leak then its water pump they are very easy to replace save money do your self i will be happy to walk you through it but makes sure that where its dripping isnt just the run down point leaks fool people some times so look at top of engine above and behind alt. for wet ness or leak i ok the go back to pump..if you want me to give repl help mail me at [email protected]
 
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