I have changed bulbs and fuses and mulit switch and still no blinkers or hazard light on driver side of a 2007 jeep liberty

Check the wires or maybe the unit itself is burned out.

Agree with lorne,but all so check the blinker flasher,and if it is good check the wire,s.

a lot of times the blub itself doen't make a good connection inside the socket, so what i'd do is remove the bulb and with a same screw driver oa a scratch ale, pry the little bare wires out a little bit away from the plastic , there should be 4 bare wires, pull them away from the bulb case and put them back in ,to make sure the connection is good at the socket....hope this helps