Relay 6 controls the Right blower motor, passenger side in your case, so it is the Left hand one that has died. Simple enough to confirm if you pull the pollen filters out you can see the blowers down the hole and see which one is moving and which one isn't. With only one blower working you will get much less air, less than half, because normally both blowers are shoving air towards the heater box and it has nowhere else to go other than through it. With one blower not working, some air will go though the heater box while the rest will just go out via the non-working blower. If you poke the recirculation button, that will close flaps between the pollen filters and the blowers and at least keep the air in the car.
You've got the opposite to what I had at the weekend. One blower stopped (due to a dead spot on the commutator), the Hevac detected the fault so cut the power to both blowers. Not fun on the first decently hot day we've had this year. Fortunately, I had a couple of spare blowers kicking around so changed the dodgy one and all back to normal.