[Cerek the Barbaric]

The best way to kill the iron golem (IMHO) is to let it get stuck in the door...as Dundee suggested...then have your fighters take turns hitting it.

My main character is a Wizard Slayer. I used him and Minsc to defeat the golem. I lured him to the door, put my character and Minsc in the little hallway, and left the rest of the party in the bedroom.

I took my fighter first, hit the golem until he cast his Cloudkill and got away from the door. I then gave the sword (Lilacor..darn good sword) to Minsc and let him repeat the process while I got healed of what minor damage the golem did to me.

I just kept rotating those two until the golem died...which only took about 2 "turns" from each fighter.

Good Luck!