Why is the no audio from either LH speakers

Hello, The issue could be the connection at the radio, junction behind the glove compartment, amplifier, or part of the circuit on from the amplifier to the speakers. Also, it could be a failure of any of those components just listed. It may sound silly, but if you have not checked to see if the balance is turned all the way to the right side of the vehicle? Also, if you are using an auxiliary input jack, try the radio to see if that produces a change.