Four problems related to defogger heater have been reported for the 1999 Ford Taurus. The most recently reported issues are listed below.
Heater core had to be replaced. Dealer stated that it became clogged because of sludge buildup.
Consumer started to smell antifreeze. Then found out that heater core was gone. She was told that there were repeated failures with these parts.
The heater core leaked previously and was replaced in 08/02. The heater core leaked again and caused fumes to enter passenger cabin. Ph.
Heater core was previously leaking and was replaced in 08/02. Heater core is now leaking again causing fumes to enter passenger cabin.