Mishimoto MMTS-JGC-99L Jeep Grand Cherokee 3.7L/4.7L Racing Thermostat, 1999-2010 Fits multiple Chrysler applications with 3.7L PowerTech or 4.7L PowerTech Lower activation temp allows coolant to flow through the engine earlier Maintains lower temperatures and extends engine life Mishimoto Activation: 180F (82C) / OEM Activation: 195F (90.5C) Mishimoto Lifetime Warranty