One problem related to defogger has been reported for the 2003 Mitsubishi Diamante. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mitsubishi Diamante based on all problems reported for the 2003 Diamante.
Anti-freeze leak on carpet passenger side near firewall fogged up windows check engine light comes on and off due to the leak the ecu started working awful.
| Defogger Heater problems | |
| Windshield problems | |
| Defogger problems |