I have a 2000 Deville DTS Just came out of shop. Its only running hot while driving, they did pressure test and block test it came back negative. So, it's not head gasket. What is it? I'm thinking water pump but have no idea where to start. Also, when the car is warmed up I'm hearing a ticking noise. I'm thinking under the intake manifold or back around valve cover.? I need some ideas on where to go So I can try to fix the issues. Thanks