The Mitsubishi 3000GT made its debut in 1991 as part of the "sports car revolution." The 3000GT burst on the scene with an impressive load of great stuff, including a 24-valve V6 with twin turbochargers, an electronically adjustable suspension system, four-wheel drive and steering and much more. The Eclipse was discontinued in 1999. Here are the do-it-yourself details for changing the thermostat in a Mitsubishi 3000GT.
Disconnect the battery ground cable. Drain the engine coolant.
Remove engine components as needed in order to access the thermostat. Label hoses and connections to facilitate reinstallation.
Loosen then remove the bolts that hold the thermostat housing in place. Lift the thermostat housing off the engine. Create a matchmark to note the orientation of the housing.
Position the new thermostat with the flange securely seated in the groove on the intake manifold. Refer to the matchmark for proper positioning. Make sure the relief valve is lined up with the mark on the thermostat housing.
Fit the thermostat housing with a new gasket. Install the mounting bolts to 16 foot pounds on the 1.8L engine; 12 to 14 foot pounds on the 1.5L and 2.0L engines; 10 foot pounds on the 2.4L engine; 12 to 14 foot pounds on the 3.0L and 3.5L engines; and 14 foot pounds on the 3.8L engine.
Refill the cooling system, recycling the coolant. Add more coolant as needed. Install the plumbing for the air intake. Connect the negative battery cable.
Start the engine and run it until the thermostat opens. Fill the radiator. Turn off the engine and let it cool completely. Check the coolant level again and add more as needed.
