Quote:
Originally Posted by speedygonzolas3
When i use my heater or air conditioner on my 98 f150, it only blows air through the windshield defrost no matter what setting its on (floor, panel, ext.) Help! I can figure out what the problem is!
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I'm pretty sure you have a vacuum operated system. This topic comes up alot so do a search for the detailed answer. But basically the problem is you have no vacuum and your HVAC system resorts to defrost when there is a complete loss of vacuum. Most likely one of your lines is disconnected or broken............