The whole cooling system was at about 75k miles and was right at the known failure range. I pulled all the old parts and replaced them with new ones.
The stock water pump is junk so I opted for a pump with a metal impeller; this would save the internals from pieces of impeller later.
While monitoring my temps with INPA I noticed the coolant temps would continue to climb during idle. I quickly ordered a 80/88 white temperature switch to replace my 91/ 99 black switch.
I added a bottle of water wetter, removed the fan clutch to prevent an explosion ruining the radiator, and as mentioned in the last blog; I removed the condenser to let more air into the radiator. I then took black BBQ grill paint and painted the radiator, as it has been proven countless times that black reduced heat.
My Z3 came with an electric pull fan used by the A/C system so the fan clutch was never needed, especially after the lower temp switch was installed. The results are it comes on super early and keeps the engine right where I want it.
Now, this clearly isn't enough; So in the future I will be: