I have a 2004 Eddie Bauer Expedition. We noticed a few weeks ago that the A/C was not cooling like it used to, and now it does not cool at all. No cold air from either the front vents or the rear system.

Tonight it is 65 degrees ambient and the clutch is cycling about every 8 seconds. Every time it cycles I hear a hissing/rushing water sound under the passenger-side dashboard.

Let me know please if there's anything that I can check myself, or if I need to take it to a mechanic. I can do basic part replacement but am not qualified enough to take apart a charged system.

Thanks!

 

Stick your head under the dash and listen for the hiss.
It could be a broken or disconnected line.

 

away_one has the win. There are vacuum lines under the dash, and a loose or broken vac line will hiss when vacuum is applied. sounds like the blend door motor line should be looked at.