Two problems related to defogger heater have been reported for the 1998 Volkswagen Jetta. The most recently reported issues are listed below.
Like others, I have had the ignition coil replaced. This happened after the warranty expired, of course. I have also had electrical problems with the windows (regulator and motor) for all of them. Now, my check engine light is flashing and the car is sputtering. I know the secondary air intake valve needs replacing but it did not cause problems. Now I'm wondering if something new is wrong??? also, I was having problems with losing coolant and had to continuously replace antifreeze. After fixing what I thought was a small leak the entire system will not produce cool air! this car has been nothing but problems and vw should look into all of these complaints.
Heater core failed and coolant leaked into the cabin along with fumes. Dealer was unable to repair did not have parts in stock.