It's not the crank pulley , it's coming from above an leaking down around the crank pulley . It's actually the water pump which is right above the crank pulley .
SOURCE: Location of coolant temperature sensor
Maybe this will help . although this is from a 1997 Caddy.
Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location
SOURCE: Where is the button for memory seats in 2005 cadillac cts
If there is not a 1 2 on the door arm above the window switchs then you do not have memory seats.
I have a 04 CTS and is like yours, no memory seats.
SOURCE: coolant leak at crank pulley
it is not the crank pulley it is the water pump above the crank pulley, the coolant runs down and looks like it is from the pulley area.
SOURCE: Replace 2005 Cadillac CTS water pump
drain the coolant.remove belt by rotating belt tensioner cllockwise. water pump pulley will require a holding tool to keep it from turning while removing bolts. access to air ratchet can sometimes eliminate the need to hold but be careful cause thats a good way to skin some knuckles. also make installation more difficult to obtain proper torque. after pulley is off just a few water pupm mounting bolts remain. clean and dry gasket surface very well before reinstalling.
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