I just bought an 03 liberty 2 months ago. Never thought to check the heater. Now with cooler weather i realize i have luke warm heat. The fan works normal. The switch turning from cold to hot really dosnt make any noise when turning. I flushed the heater core with a garden hose. Clean water came out as soon as i put the hose to the opening. I flushed both sides. The temp gauge is just below half way so im assuming the thermostat is ok. I added coolant to the cold line after i flushed the core. I tried to find the blend door but now see pics from a forum post here that the door is behind the air bag and glove box and the dash needs removed. ????? Im very much against and not wanting to remove the dash. Hoping someone can give any ideas ?? Are the blend doors a common problem in the liberty ?