AT FLUID COOLER UNIVERSAL1602 SA001 Proper Fluid Temperature Management to Enjoy Driving. Rough driving of automatic cars raises the AT fluid temperature. Excessive AT fluid temperature decreases the fluid viscosity which may cause abrasion to the built in disk and or brake. HKS A T Fluid Cooler can reduce the oil temperature while maintaining the automatic transmission performance of tuned vehicles. Vehicle Specific AT Fluid Cooler Kit Features The kit is installed inside