Just refer to Workshop Manual N:09:05. It is the troubleshooting fault tree for defrost problems (screen vents). It most likely is a vacuum problem or mechanical problem with the flap that sends the air either to the footwell outlets or the windshield. Also read N:01:02-09 for an explanation of the operation of the system. There is also a good picture in the parts manual 7-3-0. Now that the weather around this part of the country got cold I guess you want it to work well! I don't know if my defrost works as I have put my car in "hover mode" for the winter. BTW make sure the fan is turning in the correct direction as if it is backwards it will still move some air but not nearly as much as it should. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Dan RC30" <Danrc30@xxxx> wrote: I noticed that even on setting #4, my windshield defroster barely works. All the other vents work and yes the motor is turning. Any clue as to what the problem may be? > > ---Dan