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Mishimoto high-temperature thermostat for 1989–1993 Dodge 5.9L 12-valve Cummins activates at a higher temperature than stock to delay coolant circulation and promote faster engine warmup. Supplied with a high-quality replacement gasket, this thermostat is targeted at cold-climate use where quicker warmup and faster in-cabin heat are desirable, and it includes Mishimoto's lifetime warranty.
Mishimoto 89-93 Dodge 5.9L Cummins 87.5C High-Temperature Thermostat
