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Re: 2004 Jeep Liberty Heating system not working
Chances are that either your blower relay is bad or the instrument cluster on the dash is bad. Relay can be found by going to autozone and asking where it is and how much it costs.But chances are that it is located in the engine compartment back by the dash(firewall)
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PO139:O2 Sensor ckt Slow Response(Bank 1,sensor 2).This would be the odd side cylinders(1,3,5) and the 2nd oxygen sensor form the cylinder head.The sensor may be contaminated,or the heating element(on a 3 or 4 wire sensor) may not be working well.a good auto parts store should be able to show you a picture of where it is(the store will probably give you a printout if you buy the part form them!)
sounds like a bad blower resistor.The switch runs a straight 12 volts to the motor in high,but runs through the resistor on the lower speeds.The resistor is located somewhere on the HVAC unit(it requires airflow to avoid premature burnout).
Most of the times on jeeps and all chrysler auto's they have a body control modual this is what controls your door locks , windows ect. It should be in the owners manual for all fuse location and identification. A shop with a scanner can check the door lock system for you. body control moduals go bad alot on all chyslers and if you buy one you need to buy it from the dealership they will program it . So check the owners manual for a fuse and then have the body control mod checked
do you have a "check engine" light on? A bad temp sensor would give a wrong reading. Do you get heat from your heater core? Also make sure you are getting a good flow from catalytic converter and muffler so you know they aren't plugged heating up engine temp. Also make sure all your heat shields are in tact. Are you using 50/50 mix or mostly water? Though in cold temps you normally want to use more antifreeze less water, I would try more water, less antifrezze.