Ok so i have a 2004 jeep liberty and there is a weird burning smell coming from my vents and i only smell it when i don't have my air on and i smell it all the time what could it be

SOURCE: burning smell coming from my 2003 jeep liberty

I would take it to a shop right away. Do you see any fluids on the ground after you park or are you low on coolant or oil? This could be a electrical problem on its own. If you don't know what your doing don't go messing around with it.

SOURCE: Gas Smell from air vents

i would look around the fuel injector themself be sure to use a flashlight for safety and go to an auto parts store and replace the o-ring or rings on the ones that is needed.

SOURCE: Does 2004 Mazda MPV ES equip with a cabin air filter?

(cabin filter solution) Their is an cabin airfiliter behind the glove compartment (2004 mazda mpv) which is very easy to take off. Replace the airfilter or clean it with soap and water. Open the glove box and on the bottom left had side of the glove box if you apply enough presure on it by pulling it out towards you and slightly down it should pop off. The right side should slide out immediately following the left side pop. All it is, is a fork like claw holding on to a bar. On the ride side is a bar sliding into a hole. That should do the trick. After the first time its a sinch.

SOURCE: Vinegar smell coming from air vents in car.

get a cabin air filter

SOURCE: 2004 jeep liberty thermostat change?

ihave to change my thermostat in my 04 jeep liberty is it hard