Mishimoto MMTS-RAM-94H Dodge 5.9L Cummins High-Temperature Thermostat, 1994-1998 Direct fit for 19941998 Dodge Ram with 5.9L Cummins Higher activation temp restricts coolant flow for quicker engine warm-up Ideal for use in cold climates Mishimoto Activation: 190F (87.5C) / OEM Activation: 180F (82C) Mishimoto Lifetime Warranty