Am I working on the same car you guys are talking about? I say that as a joke mind you.
I've been under this damn car for over an hour, have the lower covers off, top cover and there is no way I can see I can get to the petcock. In the photo below, the green arrow appears to be a drain, the yellow arrow is pointing to the ONLY access point where I can barely get a fingertip on the petcock, a plastic bar like valve. There is no way I can turn it, it's impossible to reach from the top, and is surrounded by solid metal, I am totally stumped. Should I try to work a needle-nosed pliers through to turn the petcock? It's been REALLY frustrating and I'm about to call it a day and take the damn thing to the Caddy dealer and pay the $150.00 to flush the radiator.
Sorry to vent, you guys have been more helpful than I could expect and I appreciate it, maybe I'm just a bonehead and can't see the forest for the trees. ANY suggestions will be most welcome.
This is the bottom of the car, the radiator is behind the red frame. I MIGHT be able to snake a pliers through from the engine side...maybe.