• One possibility is that the A/C unit is low on refrigerant. Refrigerant is the fluid that circulates through the A/C system and absorbs heat from the air. If the A/C unit is low on refrigerant, it won't be able to absorb as much heat, and the air coming out of the vents will be cold.
To check the refrigerant level, look for a sight glass on the A/C unit. The sight glass is usually located on the side of the unit, and it will have two lines marked "full" and "empty". If the refrigerant level is low, the sight glass will be clear or bubbly.
If the refrigerant level is low, you will need to add more refrigerant to the A/C unit. This is a job that should be done by a qualified technician.
• Another possible cause for a travel trailer roof air conditioner blowing cold air is a dirty evaporator coil. The evaporator coil is located inside the A/C unit, and it is responsible for absorbing heat from the air. If the evaporator coil is dirty, it won't be able to absorb as much heat, and the air coming out of the vents will be cold.
To clean the evaporator coil, you will need to remove the cover of the A/C unit and locate the evaporator coil. The evaporator coil is usually made of metal, and it will be located behind the fan. Once you have located the evaporator coil, you can clean it with a soft brush and some mild detergent. Be careful not to damage the evaporator coil.
• Finally, a faulty compressor can also cause a travel trailer roof air conditioner to blow cold air. The compressor is the heart of the A/C unit, and it is responsible for circulating the refrigerant through the system. If the compressor is faulty, it won't be able to circulate the refrigerant properly, and the air coming out of the vents will be cold.
To test the compressor, turn on the A/C unit and listen for a clicking noise. If you hear a clicking noise, the compressor is working. If you don't hear a clicking noise, the compressor may be faulty.
If the compressor is faulty, you will need to replace it. This is a job that should be done by a qualified technician.
