I recently I got non running 2014 cla250. I am trying to bring it back to life and I am doing. I am replacing thermostat and water pump. I found hole in my thermostat. I wonder if anyone has any tips on replacing water pump. How do you separate pump from metal pipe. I got all screws removed from pipe, is there tool or just use rubbet mallet. I saw 2014 Mercedes CLA 250 Water Pump Replacement video but doe not cover the procedure in detail.