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Check compressor run amps is correct with a ampere meter. If less, it's under gas leak. Keep your arm on discharge line (smaller pipeline). If no heat means no gas in the system. Find leak and arrest it. Vacuum and recharge gas.Better service the unit and check. Due to condenser & cooling coil, air filter, blower wheel are dust blocked will result to very less or no cooling. Helpful?
low medium high speed of fan iscontroled by selector switch on the thermostat or recheck the thermostat if ok check control wirnig from thermostat to the fan relay on control borad and from relay to the motor.