Can't take the smell from the air condition

The smell from the rear air conditioner of my wife’s Tahoe is just plain bad! The A/C was replaced about 2 years ago. The green liquid still flows to the ground when the rear A/C is on so it is not clogged. The smell is a combination of cow manure/electrical/mulch. Please help me as we are about to go on vacation and the Texas temps are 105 right now.