One problem related to defogger heater has been reported for the 2004 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford F-150 based on all problems reported for the 2004 F-150.
When using the heat in my 2004 F-150 super crew fx4 it constantly pours out of my dash. Even when set on floor or defrost it will pour our of the dash. After a few minutes of using the heat, the ride becomes quite uncomfortable. My face gets real hot and eyes get bloodshot from being dried out. I have taken it to Ford 5 times and the first time they could see/feel the problem. Now that they cannot fix it, they tell me that it is normal operation. Which is absolutely false, especially when I own 2 of the same trucks and one does it and one does not.