Ac blowing warm air

Hello, I don't think the condenser, being a static part that acts as a "radiator" to cool refrigerant, could create anything intermittent. Either it leaks causing loss of refrigerant and in turn cooling, or it's solid and has refrigerant being cooled. The compressor, however, as well as the compressor clutch and coil could have something to do with it. If the compressor coil or clutch will not work, it could cause the light to blink and then blow warm air. Same with the cycle switch or any other electrical component of the air conditioning system. Hands on testing is required. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops