David, You can run pure Antifreeze but you will give up cooling performance. Water has a lower flow viscosity, better heat transfer characteristics as well (and most important) better heat capacity. What this means is that a given volume will transfer more total heat. The DeLorean is somewhat sensitive to this issue because of the long plumbing runs. It takes the coolant longer to make a lap around the system so every lap counts. Diluting the Antifreeze to ~50/50 gives the best compromise between heat transfer characteristics and extended temperature range/ system protection characteristics. Best to add distilled water (Reverse Osmosis drinking water will do in a pinch). Don Ekhoff ----- Original Message ----- From: <Delorean17@xxxx> Subject: [DML] coolant question > Hello, Can someone please clarify this for me? > > Will running straight antifreeze through your car cause it to get hotter?