One problem related to air conditioner has been reported for the 1999 GEO Tracker. The most recently reported issues are listed below.
Transmission-could not get car into first gear and third gear grind on the up & down shift. Replaced both gears. Two months later happened again so transmission was replaced. Three months later same problem with first, fourth and reverse. Dealership replaced the complete clutch assembly. Ac-the ac is not a big enough unit for the vehicle. Have to leave it on high at all times to cool the back seat. Suspension- the vehicle is all over the road. Very hard to handle in the wind, rain or even any speed over 55 mph. Bumper- all the fasteners holding the back molding on fell out.