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03 Expedition A/C not working - passenger side noise

5K views 6 replies 5 participants last post by  Bert 
#1 ·
At some point during the winter the A/C stopped working on my 2003 Expedition. When the fan is running in A/C mode, there is a periodic (10-15 seconds between) hissing sound that seems to come from under the passenger side dashboard. When the fan is switched to vent mode, the sound immediately stops. It doesn't produce any cold air.

Any ideas?
 
#6 ·
I think I have a similar problem. When I turn the air on nothing comes out of the dash vents. The rear air seems to be blowing cold air fine. When I turn everything off there is a hissing noise from behind the selector switch, but otherwise no other noises. Also i can not get any air blowing through any of the vents; floor, defroster etc. The problem was also fairly immediate. The ac was working ffine the night before and the next morning not at all. Any help please?
 
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