Rebuilding mine 02 Liberty that was wrecked in the front. We offered all brand-new parts native an 05. Mine 02 has a 2 wire plug come the electrical fan, the 05 has actually a 3 cable plug. So, we cut off the 3 wire plug and also put the old female next of the 2 cable plug ~ above the fan and also connected it to the High rate side, then then the short speed, climate both together. NOTHING. Mine temp gauge inside will certainly not relocate past 1 needle mark before half. It was 82 levels yesterday i let it sit in ~ idle because that 1hr and the electrical fan would certainly still not kick on. Ns OHM experiment the coolant sensor by the alternator and it appears to be functioning fine.Possibly relay under the battery box? If ns unplug the coolant sensor the pan kicks on like it should. Just how do you check the relay? ns still to run the mechanical fan so perhaps the coolant is simply not reaching the correct temp to absent on the fan. BUT, it was hot yesterday, ns strongly feeling there is a problem somehwere. Is there any other ways to cheat the mechanism into transforming the fan on? ns at a loss.


You are watching: 2003 jeep liberty radiator fan control relay circuit

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The e-rad fan just comes on at details conditions.OPERATIONThe electrical radiator cooling pan is managed by the Powertrain manage Module (PCM) v the radiator cooling fan relay. The PCM regulates fan operation based on input native the engine coolant temperature sensor, battery temperature sensor,airconditioning select switch and also vehicle speed. The fan is not energized throughout engine cranking nevertheless of the electric input native the temperature sensors and also ,air air conditioning switch. However, if engine operation problems warrant fan engagement, the fan will certainly run when engine starts.Vehicles Equipped v AC:In addition to using coolant temperature and also battery temperature sensor to control cooling pan operation, the cooling fan will likewise be involved when the ,air conditioning mechanism is activated. The relay is likewise energized when, air air conditioning is selected and coolant temperature is over 95° C ( 203° F), or , air conditioning is selected and also battery temperature sensor is above 41° C (106°F). It will then de-energize once , air air conditioning is selected and coolant temperature is below 92° C (198° F), or , air conditioning is selected and also battery temperature is listed below 38° C (100° F).Did you check the fuse to the radiator fan relay?
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renegade 04Full access Member
JoinedJan 3, 2014Messages1,466Reaction score15LocationAlbany new York
Yes, you have the right to trick the jeep so that you have the right to activate the cooling fan. I did and also it to be a cool mod and also it would simple for you since you have actually only one speed however you deserve to make it occupational with both high and also low.
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KarausNew Member
JoinedMay 5, 2015Messages8Reaction score0LocationIndiana
Vehicles Equipped with AC:In addition to using coolant temperature and also battery temperature sensor to manage cooling fan operation, the cooling fan will also be involved when the ,air conditioning device is activated. The relay is also energized when, air conditioning is selected and coolant temperature is above 95° C ( 203° F), or , air air conditioning is selected and also battery temperature sensor is above 41° C (106°F). It will certainly then de-energize as soon as , air air conditioning is selected and coolant temperature is listed below 92° C (198° F), or , air conditioning is selected and also battery temperature is below 38° C (100° F).Did you examine the fuse come the radiator fan relay?My fan does not come on when i revolve the ac on. Im still rebuilding the jeep so it no have any coolant in the ac lines. It additionally has the newer layout 3 wire pan on the while my jeep is the old 2 wire so i was led to think thats why the pan does not come on when i rotate the ac on. True? also the fuse is good. Ive swapped and replaced the fuse multiple times. The only way ive to be able to obtain the fan to kick on is unplugging the coolant sensor and also providing power directly from the battery. Deserve to you check the relay anyway? After reading the ohms of the coolant sensor it appears to be functioning fine.It sat at idle for approximately 1hour in ~ 82 levels F external yesterday. Surely at that temp the coolant and also battery temp would certainly be approximately par because that it to absent on. My temp gauge on the cluster will not relocate over half.Possibility the it just not obtaining hot enough? seems unlikely.
Last edited: may 5, 2015
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uss2defiantFull accessibility Member
JoinedJun 25, 2014Messages3,518Reaction score110LocationTucson, Arizona


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False, ns think that shouldn"t matter if you have actually a 2 speed (3 wires) versus a single speed fan (2 wires).Without AC, the fan have to still come on regardless as soon as it gets warm enough.If I check out my 03 FSM correctly, to check whether the relay is quiet functioning mechanically, friend can use at +12V prejudice to pen 4 i m sorry is the regulate line the the relay. I would do this unplugged native the car. So by applying +12V on pin 4 through pin 3 as ground, pen 1 and also pin 3 will certainly be linked (use conductivity test here).On a side note, execute you have actually a clutch fan? If for this reason you"re still it s okay with just that.If the temperature gauge is no at half, not sure whether it reached operating temperature. That would certainly be weird if it wasn"t if you were simply idling it for an hour. :shrug: