coolant drainage

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2003 protege 5
hello ,can anyone tell me how to drain the coolant on my protg 5,is it at the bottom of the rad and how would I access it,do I need to take off the plastic shield at bottom of engine ,thanks Alex
 
thanks Paul I found it, my other problem is that I took my car to a mechanic and gave him a thermostat valve to replace but I suspect he didn't change it so how can I tell if it has been replaced.I have the therm stat housing off and have the stat in my hand
 
... so how can I tell if it has been replaced.I have the therm stat housing off and have the stat in my hand

I don't really know other than it should look "new".
No rust, corrosion or deposits on it.
 
Im not sure MrGiggle I bought it new at dealer and gave it to him to install, the one I removed looks new How can I tell if its not the original one, it was never changed before, also is there supposed to be a gasket on the housing for the thermostat.
 
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