ytech15, remove the water pump pulley and the water pump. Spray some penetrant on the broken bolt and let is soak for 10 minutes or so before attempting to remove with vise grip pliers. If that doesn't work try: 1) using a dremel tool to grind parallel flat surfaces so you can use an adjustable wrench to loosen the broken bolt, or 2) drilling a hole into the broken bolt shank for an E-Z Out to remove the broken bolt. Whichever method you choose stuff a rag into the block to keep out metal chips.

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Fred Hoelzle