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Re: 02 Jeep Liberty overheating when a/c is on
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There are 3 reasons a heater blower will not run. I will list them in most common cause order.
1. No power to the motor.
Check the fuse (it is listed in your owners manual).
Check for power at the motor.
If the fuse is good and there's no power at the motor then it gets complicated and you should take it to someone with experience in fixing these.
2. Motor is bad
Remove the motor and apply power (12 volts) to it. If it is good it is going to spin fast, so better hold on tight. These things can hurt when they are loose and turned on.
3. Something is blocking the fan.
Remove the motor and look for the pencil (or whatever) may be stopping the fan from turning.
If what I've written doesn't make sense, then I would suggest either take it to someone who has experience or buy a repair manual (and other tools) and plan to spend some time reading and experimenting.
P0161 is 02 heater Circuit ( Bank 2 Sensor 2 ). There is no mention of any Fuse and there should not be .Circuit refers to the two wires extending from the jeeps computer dirrectly to the 02 sensor in question which would be in this case Bank 2 sensor 2. So the computer is transmitting a signal to the 02 sensor and not receiving a sgnal back it automatically thinks the circuit is at fault, when it is not.It is not receiving any Data back from the 02 sensor because the sensor is defective and needs to be replaced. If you replace one sensor you should replace all 4 of them. If you only replace one then it will be transmitting Data back to the computer at a much faster rate than the other 3 old ones and this could cause more problems and more codes to be set by the computer.Remember to have all the codes cleared from the computer after all repairs are compleated, This will turn off the check engine light. Good Luck and have a good XMASS.
CHECK COOLING FAN FUSE OR CONTROLRELAY.IF ALL IS GOOD.HOT WIRE COOLANT FAN IF FAN WORKS PROBLEM IN THE COOLANT TEMPERATURE SENSOR OR WIRING AND PCM.IF COOLANT FAN DONT RUN WHEN HOTWIRE FAN MOTOR DEFECTIVE.
Sounds like low speed coil in the Blower Fan resistor block has failed. The Blower Fan Resistor Block is usually located in the air ducting adjacent to the Blower Fan. The Resistor Block consists of 3 or 4 coils of special resistance wire attached to terminals which connect to the wiring that comes from the fan switch and then to the Blower Fan. The block is on the output side of the fan unit so that the airflow from the fan past the coils inside the duct assists in preventing them from overheating and burning out. Access to the Resistor Block is from under the dash. To replace, remove the multi-pin connector and then undo the screws holding in the block. Check air duct for leaves and dirt which may have caused the coils to fail. .Replacement is the reverse procedure
Need to know what caused the overheating, possible broken serpentine belt, thermostat, water pump, radiator, fan clutch, cooling fan motor. After motor has cooled down fill radiator with water till full, look make sure serpentine belt not broke, start engine run about 5 minutes, turn off, let sit 3 minutes, start engine look at temperture gauge is it over half way of gauge, Do you have a fan blade driven by water pump or electric fans?
I'm sorry but I'm not sure what exactly the issue is. You stated the Jeep overheated, correct? Then you stated that you had previously taken the Jeep in for work on the a/c. Was this previous to the overheating? And which fan motor are you referring to? The interior vent fan motor or the cooling fan? The cooling fan has nothing to do with the a/c. It may help increase it's efficiency but the a/c will work fine with out the cooling fan. If you are having trouble with the engine cooling fan after the work you need to return there and make them fix it. You must also remember that the coolant fan works intermittently when the temp reaches the cut-in an cut-out setting. As far as the plug on the fan itself it is a simple connector and easy to replace.
The thing that is of most concern should be, how is the vehicle running since it overheated? The liberty has twin overhead cam aluminum heads. These are susceptible to warping caused by overheating. If you are need to constantly check and fill the radiator due to overheating you may have other issues other then the Coolant fan.
Please repost with what motor was repaired (a/c vent or cooling fan). Also did you notice a sweet smell to the smoke when the Jeep overheated?