No Freon/410 gas will NOT cause a compressor short cycling. Sinjce you state the compressor does come on and runs for 10 seconds or so, and the unit is 8 years old, I would suspect a BAD compressor pulling excess amps. Possible you have a bad Start/Run capacitor as that will cause your symptoms too. But I look at the AGE of the unit for what I state. Regardless, if you do not have the tools or knowledge, at this point you have to have a professional look at it to determine if it is the Capacitors or the compressor. IF you are a fulltimer or use the RV more than 50% of the year, replacing the RVP/Coleman top unit after 8 years would not be a big waste of money. Doug