I'm not understanding if your blower motor/heater motor/fan(in the heater box behind the glovebox) is working or not? You would hear it behind the glovebox. You might not be able to really hear the compressor running but you may be able to hear the clutch kick engage and the rad fan turn on under the hood.
I had a mirage come in once that had very little air flow, all they said was the heater doesn't work. They had so much junk in the glove box that it was overflowing and something fell out jamming one of the doors in the heaterbox.
When you say the defroster, you are talking about the windshield defrost and not the rear defrost button right?
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)