How to change water impeller on 97' 150 EFI Merc?

Anyone know how to change this? The motor is immediately overheating and does not discharge any water, or any ideas on what else it could be?How to change water impeller on 97' 150 EFI Merc?Get a copy of the Mercruiser/Mercury Marine or Chilton's shop manual first! Either will describe the proper procedure for replacing the impeller and give you a troubleshooting guide! Good luck