Has the windshield been replaced? If so, it's possible that the seals were not set properly and air is in fact coming in from the sides or top of the windshield. You should check to see if the chrome molding around the windshield or the rubber seals that may be exposed appear to be damaged in any way. If you had the windshield replaced, the shop that handled the repair should be willing to fix if for you.
If the culprit is really the windows, you need to have the rubber gaskets repaired to create a better seal. Sometimes they come loose and droop a bit. A body shop can check them and glue them back in place if you aren't able to handle the task. If you are able and willing, an auto supply store can set you up with a tube of adhesive that will do the trick. If the rubber gaskets are cracked and torn in spots, this will cause an annoying air leak and they will need to be removed and replaced.
If you can't figure out where the noise is coming from as you drive, have a second person ride along and listen to the wind noise as you drive with the radio off and the windows up. If the car is a 4 door, have them ride in the back seats to see if they can trace the air leak.
Good luck.
SOURCE: I have a 2004 Ford explorer. No heat but blowing
if you have the automatic temperature control or electronic air temperature control your problem is probably the air temperature blend control motor. you'll have to replace it. checked the linkage from the blend door lever to the control motor first. make sure it is connected properly. if it is, play sure finger on the lever and feel for the vibration associated with the clicking. if you can feel it, replace the control motor.
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