Question about 2002 Jeep Liberty

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I have a 2003 jeep liberty with 3.7 ltr with a overheating problem. The fan will not come on. I have cheched the fuse under the hood and wired the fan direct and it worked fine. what else can i check?

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If the fan runs when connected directly by 12 volt battery,then this indicates problem with fan relay. The thermostat can cause the engine to stay hot. This can also be the problem if the gauge stays low and the car never heats up. If the temp gauge is reading low yet the two radiator hoses are warm, the temp sensor may not be working. There may also be two temp sensors or senders, one that controls the gauge and one to switch the fan on. If the temperature is getting high and the fan still won't come on you may have a fan problem.When the car is getting hotter than normal and the fan should be on, unplug the fan wire. The cooling fan wire will have two wires positive and negative, and should be putting out 12 volts dc. If there is no voltage check the wires and the fan relay. The cooling fan relay is usually under the hood. If there is voltage running to the cooling fan, you probably have a bad fan. You could try jumping wires to the fan directly from the battery,If the fan runs by connecting it directly to battery then its faulty relay. The typical electric cooling fan circuit includes a temperature sensor, a relay, a control module and the fan motor. The relay is the component that fails most often, so be sure to test the relay as well as its power supply and ground connections.
A good relay coil will typically read 40 to 80 ohms. If resistance is high, the coil may still be working but it is failing, or it may not work when electrical loads are high. If the coil has no resistance, it is open and has failed. Replace the relay.
Another simple relay test is to shake it. If you hear something rattling inside, the relay armature is probably broken.
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Posted on Sep 13, 2010


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The only fuse box I see is under the hood, is there another fuse box 2003 jeep liberty 3.7

I think I just answered this one but if you're a different person here it is. now this is a picture from a 2004 but am almost positive it will be in the same location. I hope this helps and good luck.


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2005 Jeep Liberty Heater fan motor speed control , no low speed only med & high there a fuse for low speed?

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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

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My a/c will blow hot air and then the car will start to over heat

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?

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If yor liberty is a 2002 to 2004 it is very likley that the wiring harness is pinched under either the drivers or passengers seat. you need to remove the seats (its only 4 bolts) and lift up the carpet and look at the harness that runs under the seats. I have seen this many times before.By the way i am a Jeep master technicain and have been for 15 years.

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