If the right side lights work it means the flasher unit is ok , check for a blown fuse or faulty flasher indicator switch.
SOURCE: Turn signal left front won't flah
I dealt with a similar problem on an 01 Alero (very similar car) and found that the wire that grounds the signal filament of the bulb was broken inside the harness. I tapped into it and grounded it to the chassis and resolved the problem. It's no guarantee but if you have a multimeter, check each wire's continuity to ground as well as the impedance between each of the wires on the harness, on both front signals (for comparison purposes), and it'll show you if you have a problem such as the one I dealt with.
SOURCE: light indicator problems
I would say try and REPLACE the turn signal fuse/relay. It should be a square, black fuse/relay on your fuse panel. They run about $10.00.
SOURCE: Left turn signal works intermittently; bulb changed, same problem
check the socket for corrosion or burnt terminals
SOURCE: Turn signals dont work 97 Geo Metro
I had that problem on a 90 Metro. I found a plug located on the top side of of the fuse pannel under the dash came unpluged.
SOURCE: MY Fiat stilo windshield wippers front and back
try changing the wiper relay in the fues box, it might be u/s and sending wrong signal to motors hope this helps
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