The alternator may be going bad.
1990 was the first year of the Geo Tracker. 1999 was the first year of the Chevrolet Tracker. So the answer to your question is 1999.
It is not a "warning" light but an indicator that you have pressed the button near the shifter to put the tranny into tow mode.
195/75/R15
Remove rubber boot. Pull off plug. Twist light bulb 1/4 turn and bulb should come out.
Interstate auto body parts 35670-67D00, www.certifit.com, 1-800-634-4925
behind the glove box
The relay under the dash is either disconnected (a lot of people do this) or it isn't working.
If the reverse lights are not working on a 1999 Chevy Suburban, be sure to check the fuse panel. If all the fuses are in working order, check the wires for any loose connections. Faulty wires can result in little or no light input.
what does it mean if my brake light is blinking on and off when its pushed down in my 1999 Chevy silverado
Pull the engine.
When you have the heater on, does it just blow any air at all? or no air?