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Old 07-19-2011, 07:56 PM   #1
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AC Problem

When I turn on my rear AC (Dometic) the fan runs and I hear a slight hum for about four seconds then stops. It appears about every two or three minutes. The air is not cooling.
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Old 07-19-2011, 08:03 PM   #2
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Always the first thing to check is the filter around the On/Off/Cooling switch. If that thing is dirty, the AC will not perform correctly.
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Old 07-19-2011, 08:40 PM   #3
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You need to replace your compressor starting capacitor.

Disconnect AC power, and disconnect the house batteries.

Pull the cover off, look for a panel that covers the wiring. Under that you will find either one multi-capacitor or two capacitors. Trace the wires from the compressor and replace the one that those wires are attached to. TURN OFF THE COOLING until you replace it or you could damage the compressor. You can run fan only.

P.S... make SURE you don't touch the terminals on the capacitors as they can give you a shock!
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Old 07-19-2011, 09:20 PM   #4
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AC Starter Cap.Pictures,

Robert, Hear are some pictures of the Capacitors mentioned.They do hold a charge and if your not familiar with or worked around them,get some help.
Its not the fall that hurts,its that stop at the bottom. You are like 12 feet in the air while working on the thing.

There are three caps.Blower motor start run,AC compressor start and AC run Cap. The little black square item is a start relay.
There are wiring diagrams under the cover,do your self a favor and take some pictures of the wire connections before removing anything.

Dick.
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