Thank you, gentlemen. I'll have a go at it today to see if my penetrating oil helped.
I tried attaching a variety of socket and extender configurations. Even with the hose removed the nipple for the coolant hose at approximately 4 o'clock to the plug severely limited access. I was able to slide the unattached socket into place but there wasn't enough horizontal space between the plug and nipple to fit an attached socket and drive... if that makes sense.
Perhaps I just don't have the correct extender. The socket would almost need to be fixed to the wrench at a 90 degree angle to clear the limited head room. I'll have another look today.
Thanks again.
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