That's the one bolted to the engine, not the top piece with the radiator hose attached. Mine was leaking from a crack. It's near the top of the engine, looked easy enough, I thought.
Remove serpentine belt. Remove belt tensioner. Remove radiator hose and thermo cover casting. Remove dipstick tube. Remove power steering pump. Leave hoses attached. Remove alternator. Remove air con compressor. Leave hoses attached. Remove steel bracket with belt idler pulley. Remove alum bracket that the pump, alt and A/C comp were mounted to. Then you have access to the small screw at the bottom of the thermo housing, which can be removed at last.
I'm losing interest in this car.