We have a 2006 Ford Expedition. The AC stopped blowing cool air and began blowing warm air. We had refrigerant put in and it blew cool for a few days and then it started blowing warm air again. We then went to the dealer and they said the compressor needed to be replaced. Should the compressor be shot on a fairly new vehicle and what is your suggestion?
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chances are they did not hook up a vacume line that goes to a actuater the opens and closes one of the vent doors under the dash you can look under there and should be able to see the two lines running down from under dash on the passenger side follow them.
I am guessing here as I don't know which control unit you have, but I believe you may have the one like in the video and the video shows the repair you will need to make. Hope it helps.
I would check the following possibilities: 1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.
2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.
Could be other issues, but I would start with these.
This sounds like a blend door or actuator problem. Testing this is a pain and the repair may envolve removing the dash board and center console. I strongly recommend taking the vehicle to a repair shop. This one is beyond the DIYer especially if your pressed for time.
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