Question about 2002 Jeep Liberty
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. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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