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  #1  
Old 07-06-2012, 03:01 PM
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Radiator Fan Not Working

So I left the car wash this morning an noticed my temperature gauge was rising higher than it normally does. I pulled into the nearest parking lot and lifted the hood. I noticed that the engine seemed really hot (temperature gauge got to about 3/4). Then I realized the radiator fan was not even going. So I tried to spin it and it went free so it is not seized. I have been reading and people said to try a new relay. There are two relays, hi and low, and of course my local parts store only had 1. So I picked it up and tried it an still nothing, I turned the AC on thinking that should kick it on but it didn't. I tried the other relay and still nothing. The fuse looks alright in spot 23 so I am very confused. Should the fan only kick on at a certain temperature or when you turn the AC on should it come on? Am I missing something easy or should I be looking at something different? Do the relays normally go in a pair? If one is shot will the fan work at all?

By the way this is an 07 Jeep Cherokee WK 3.7

Any help would be great! Thanks
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Old 07-07-2012, 12:58 PM
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Re: Radiator Fan Not Working

The AC is connected to the ac compressor. DIfferent fan. If the fuse looks good then it is probably good. Check the fan connections. Swap a relay? The fan will turn on after the temperature reaches about half. Usually comes on when the car is standing still due to the small amount of air circulating through the radiator.
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Old 07-07-2012, 05:52 PM
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Re: Radiator Fan Not Working

No the AC will turn the radiator fan on to pull air across the condensor.

Your going to need to check for power at the fan, the fan can still be failed and spin just fine by hand, considering you dont have high or low I would lean towards a fan or fan connector concern.

I dont know how handy you are or how much you understand electron flow, without having a scantool to actuate a fan relay your going to need to send power from the relay (pull it and take a jumper wire from the battery to the now empty pin 87 in the PDC... If the fan comes on you know the fault is before, if the fan doesnt come on you know its after, in that circuit or the fan itself.
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Old 07-09-2012, 02:06 PM
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Re: Radiator Fan Not Working

So It ended up being the fan motor. When the car was running I would hit the motor with a mallet and I would get it to kick on for a bit and then it would give out until I hit it again. The radiator fan is pulled and the new one is on order.
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Old 07-09-2012, 02:08 PM
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Re: Radiator Fan Not Working

i just noticed my radiator fan is not working either , my engine fan works but not the smaller one on the radiator. could this be why my engine temp is running a tad high? wouldnt the air while driving at highway speeds keep it lower than the halfway mark? is the radiator fan only supposed to come on during idle?
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Old 07-09-2012, 06:03 PM
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Re: Radiator Fan Not Working

Yes it would at highway speed. The radiator fan only turns on once the temperature reaches a certain temperature I believe its about half. But on highway speeds it should run very cool.
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Old 07-09-2012, 06:43 PM
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Re: Radiator Fan Not Working

Your electric fan WILL turn on with your A/C switched on, I was 100% certain it did BEFORE I went out to test it simply so I could say I tested it. So for clarification, I just tested it on my own rig, and the electric fan turns on with the A/C on.

Having said that Matt, as I already suggested, when its hot out I run right at the middle hash mark, when its cool I run just mm or 2 below, with a known fully functional fan. It has done this for the 1.5 years I have had it, first noticed while I was towing and it freaked me out for a second but it has NEVER gone above the 1/2 hash mark. Not to say that a new temp sensor may not resolve the gauge issue as I think there is a resistance range where it sits at the 1/2 mark, this way the user doesnt see temperature fluctuations, but if the sensor or circuit wears just beyond its happy zone you may see some gauge fluctuation. Ultimately the temperature sensor is an NTC thermistor, as the temperature goes up the resistance goes down, so that pretty much scratches a circuit fault unless somehow the minimal resistance in the circuit finds a way to get even less on the same size wire. So your looking at a gauge concern, or a temp sensor concern... or its just straight up normal and someone at chrysler dropped the ball on this one... either way your cooling system is likely working just fine.
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Old 07-09-2012, 07:04 PM
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Re: Radiator Fan Not Working

Im just worried that something was done incorrectly by the body shop when replacing my front end. It seems like i will have to figure out when the radiator fan is not working at all. I know the coolant is messed up. It is half green and half the mopar coolant. I drained as much of the green crap they used as possible but i didnt wanna spend $100 to buy more mopar coolant.
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Old 07-09-2012, 07:06 PM
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Re: Radiator Fan Not Working

I just dont want to be driving to florida in 95 degree weather for 16 hours and have my jeep overheat. Based off what you said to me the other day i determined it is not the temp sensor so i returned that part
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Old 07-09-2012, 09:28 PM
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Re: Radiator Fan Not Working

No doubt, I completely understand your fears! I would suggest you go and have the body shop pay to FLUSH your system, mixing the two is bad bad bad.
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