we bought our 2014 impreza sedan used @ 80,000 ish miles. suddenly ac got weaker and did not work on driver side at all. also there is some noise under the front hood but not only when ac is on. dealer says they spent hours looking but found no leak. they refilled ac which made the passenger side cooler, and say we need a new ac condensor for 00. how do we tell if that is the problem?