A coolant leak may develop from the heater core, requiring replacement of the heater core.
Problems for specific Mitsubishi Diamante years:
Car problem reports
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Most reported 2003 Mitsubishi Diamante problems
A brake pedal pulsation may be noted on brake apply. This is commonly caused by warping of the front brake rotors. Our technicians remind us that re-machining (turning) the rotors can correct this issue but the repair may last only a short time as the thinner rotors would be even more prone to warping. Replacement of faulty rotors with high quality parts is often the best option in these situations.
The seat belts may not properly retract due to an internal fault with the retractor mechanism. Replacement of the seat belt retractor would be required to correct this concern.