[rdass623]

sometimes it is the expansion valve which gets stuck open (so i have read). i had a similar incident, which i could not duplicate. i also actuated the purge valve quite a few times (pulled on the wire ring opening and closing the valve). i just topped off the reservoir purged the air from the system and it has been fine for the past 3k. i also closely monitor the engine temp and constantly looked in the rearview mirror for the next couple of weeks for the tell tale signs of leakage.