One problem related to defogger has been reported for the 2000 Mercedes Benz ML320. The most recently reported issues are listed below.
Intermittently in cold temperatures when the defroster system is engaged it will disengage for a few seconds, then come back on. This reduces the driver's visibility and could cause an accident. Defroster system continuously does this until vehicle is turned off. This occurred on 3 separate occasions. Dealership serviced vehicle and replaced parts, but the problem still persists. In addition, consumer experienced fuel tank gauge shows only 3/4 full. Dealer stated that internal electrical fault in the fuel sending unit. Fuel sending unit replaced.