Thermostats Back to Mopar Index   Thermostats It is important to replace your old thermostat to insure proper water flow thru your engine. We have a variety of temperatures in stock to match your climate. It is recommended that you replace your thermostat when you change your antifreeze. 1930-33 all models (no bypass) $18.75 1934 all models (has tilting flap bypass) $64.75 1935-54 models with bypass $22.75 1935-54 models without bypass $14.75 1955-75 all models $14.75