could also be the in-line drier(part of the A/C pipework) choking, will be ok for small amount of time but will eventually slow flow of refrigerant and cause a trip at pressure switch, the condenser fan should run when the compressor comes in although some systems will keep it off on start up until it reaches optimum pressure then cut in, also could be a 2 stage fan, 1st stage could be running 2nd stage not coming in, then trip press switch again, A/C engineer will tell you, kwik fart only good for re-gas, past that it needs better equipment, try and get a guy to do it as a homer,