Hello, the fan speed issue sounds like a classic case of a failed blower motor resistor -- at least to start with.
Your air conditioning problem sounds like an electrical concern that will need troubleshooting performed to determine the root cause of failure for.
Not all situations require refrigerant to be added. In fact, doing so is extremely environmentally irresponsible -- if it's not needed. If system pressure becomes too high if refrigerant is added and not needed -- because of a lack of know how or proper equipment, then you will actually release the unneeded refrigerant into the atmosphere, contributing to the damage to the Ozone layer.
Seek professional guidance near you.
Air conditioning problems can originate by one of the following general areas:
1) A problem with the refrigerant system. Meaning, the refrigerant used has escaped and there is not sufficient refrigerant to pressurize the system properly, resulting in hot air. When this happens, the system must be checked for leaks, the leaks repaired, and the system recharged.
2) A problem mechanically or electrically with the under hood components. If the compressor has failed, it will not allow the system to operate. Further, if the system becomes contaminated with debris from a failed compressor, this can be even worse. Electrically, the coil of the compressor may not be working properly, or a cycle switch could fail preventing the system from operating. If your condenser fan is not working, the system may not work properly also.
3) Climate control problem inside the vehicle. If the system that operates the heating, ventilation and air conditioning system fails to operate properly, then the under hood components may not be turned on or off properly, keeping the cold air from being produced.
Only testing these systems will yield a direction and an eventual result.
