AC Clutch cycles on goes 15 min. and then off

Just charge the system(Fill it)to the proper level.

Several things could be causeing this. First you should do a system pressure check. Connect a set of A/C gauges, the low side pressure should be between 25 and 45 psi and the high side around 150 psi (plus or minus depending on ambient temp) with engine running & comp. clutch engaged.. If the low side pressure starts to drop and continues to drop it is because there is air and moisture in the system, which vercomes the dessicant inside the system and it will freeze up at the expansion valve. If the system is frozen up, nothing moves, so the compressor is acting more like a vacuum pump and will kick out. Have a HVAC professional evacuate the system, (may need to replace the receiver-dryer), add a bit of oil and then charge the system to mfrs. spec. Then u'll have air.
It's likely it was not charged correctly the last time that caused this problem.
Good luck...I hope this helps.