The adjustment handle for the dashboard vent to the left of the driver fell off and I cant figure out how to get it replaced without spending $200 for a small fix like this. Is it possible to replace the handle only or the vent only without having to tear apart the whole dash? This jeep has the vents that angle toward the driver and toward the person in the passenger seat.

SOURCE: Heater problems on my 2000 Jeep Grand Cherokee. Please Help!!

There are 2 seperate zones for the drivers and pass. side, but they use the same thermostat.
There is a blend air door motor that controls this.
The one on the pass. side is probably bad.
These are kind of hard to replace.
There are on the bottom of the heater box and you need a philips screwdriver about an inch in total length.
There is not that much room between the bottom of the heater housing and the floor.

SOURCE: 1997 Jeep Grand Cherokee with water in the floorboard

Yes but drill the hole in the passenger compartment on the bottom of the box where it slopes down to the drain. Blow out the hole with compressed air and then plug the hole with a rubber plug or silicon. If you use silicon let it dry for a least 2 hours before running your air conditioner. Now if it happens again you have an access hole to clean out the drain. You want to drill the hole toward the firewall like you were drilling toward the drainhole.

SOURCE: 2006 Jeep Grand Cherokee Laredo ac not cooling

My 1999 limited does this. When i bought it off the guy he said that its because of some flap down by the passengers left foot. In mine the passenger air barely even blows because of this.

SOURCE: need to know how to take apart dash to replace radio

Likely it's not much different than ones just a bit older...remove the bottom panel and any screws along the bottom of the plastic dash face plate. The top is held on with clips and it should pull out, exposing the radio mounts. Go from there. They make a face plate adapter for the radio and a harness extension to help with wiring, available where they sell aftermarket radios.

SOURCE: Air whistling into vehicle through brake rubber boot/seal

You should be able to replace the boot. Without seeing the vehicle, you should be able to disconnect the shaft going through the firewall and get the boot off/on that way.