The air conditioning in your 2003 Dodge truck cools the cabin when it is hot outside. The AC system uses a compressor to compress a refrigerant and then pushes that cold air into the passenger cabin with a fan. When this system breaks you may need to replace your air conditioning components. However, before you do that, troubleshoot the problems.
Pull down on the fuse panel cover under the steering column.
Locate the fuse for the air conditioning using the fuse diagram on the underside of the fuse panel.
Use the fuse pullers in the fuse panel to pull the fuse for the air conditioning.
Replace the fuse if the metal strip inside the fuse is broken.
Turn the fan motor to the highest setting. Then turn the air conditioning to the coldest setting. Pay attention to whether you hear the air compressor start. You should hear a low "hum" when the compressor starts. If you don't, the compressor has not started. This means the compressor has failed and you need to replace it. This is confirmed by the lack of cold air coming into the cabin after a few minutes of having the AC on. If the AC compressor starts but there is no cold air coming into the cabin, there may be a leak in the AC system or the system is out of refrigerant. You will need to have the system serviced by a professional mechanic.
