One problem related to defogger has been reported for the 1999 Mitsubishi Diamante. The most recently reported issues are listed below.
Smell of antifreeze inside car, windows fogged up making it very difficult to drive. Mechanic says is likely heater core failure, $700 to fix.
| Defogger Heater problems | |
| Interior Rearview Mirror problems | |
| Defogger problems | |
| Wiper problems |