Heater fan doesn't work.

Check fuse and relay as mentions in the link. Also the BCM is involved with climate control in which case you will need an auto electrician with a pro grade scan tool computer.

https://www.google.com/search?q=2003+liberty+heater+fan+does+not+work


Relay 33 in the Power Distribution Centre

Fuse Box Diagram Jeep Liberty / Cherokee (KJ; 2002-2007)

https://fuse-box.info > jeep > jeep-liberty-kj-2002-2007...
Here you will find fuse box diagrams of Jeep Liberty 2002, 2003, 2004, 2005, 2006 and 2007, get information about the location of the fuse panels inside the ...

bad blower motor resistor is why the fan only runs on high. air in cooling system of blocked heater core is the reason it isn't hot

no idea to be honest earlier jeeps had then at the front of the wing down below as i remember ?? newer one would i imagine be in the electrical box under the bonnet near the battery

the heater fan is dead. blower.
check the heater fan fuse for BLOWN.

You can get the silicone grease at automotive and hardware stores. Apply to rubber seal on cap about every 2 to 3 months. This will ensure a seal so that the engine light doesn't come on. Worked great on My 2008 Liberty.

under the glove department is a heater motor resistor you can look the part up on ebay , it located under the glove box ,, place in a cut out , you have to look carefully but it is there ...i beleave one screw holds it in ,, it a easy fix ... just swap the old part for the new ..

replace fan switch

Your heater motor speed selector only working on a couple levels is caused by a faulting blower motor resistor.This part is located on the evaporator case next to the blower motor itself.Two bolts remove the resistor and an electrical pigtail finishes it off.The location of this is underneath the dash on the pass front side.Happy Holidays!!

No this shouldn't be a big problem. It sounds like it is just the blower motor relay.

What do you mean you "went through a car"??? Did you crash???
Generally one speed being "out" is caused by a burned out relay or resistor pack. Check those!!!