Question about 2000 Jeep Grand Cherokee

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Cooling fan relay is getting hot and failing. Replaced it two times. Dont know if its just drawing to many amps. I wired up a on off switch for now. ????

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That seems to be something of a chronic issue. I have heard that some off-roaders move the relay to another cooler location where there is more air flow by extending the wires. That is likely why Jeep puts it where it is instead of in the power distribution center. If you move it, I'd also consider doing a bit of weather proofing on the connector though or you'd be trading one problem for another.
One good place might be inside the lower part of the air cleaner box. There is always a good clean supply of moving air there whenever the engine is running and plenty of room as well.
I'd also make sure the fan motor isn't drawing too much amperage and that all connectors and grounds are good as all can cause extra resistance in the circuit.

Posted on Sep 08, 2010

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Chrysler town&country after overheating getting p1491 code how to resolve it ?


Start your diagnosis at the fan relay module which is located below the battery box on the left frame rail. The Grey wire is hot at all times and fused by fuse #24 in the power distribution center. The Black wire is the ground. The Light Green/Dark Blue wire goes to the Powertrain Control Module which provides ground to the fan relay when cooling fan operation is needed. The Dark Green wire provides switched power to the fan motors.
Using a digital test meter, check for 12 volts on the Grey wire. Check for good ground at the Black wire. If you have good results with those two tests, ground the Light Green/Dark Blue wire at the relay. The fans should start up and run at high speed. Now is a good time to check the current draw on the fans-they should not draw more than 15 amps. If the fans do not run, check the operation of the fan motors by jumpering the Grey wire to the Dark Green wire. If the fans work, the relay is bad.
When replacing the relay, always clean the mounting surface and apply new thermo grease.
To check operation of the PCM, disconnect the connector to the engine coolant temperature sensor and check the Light Green/Dark Blue wire to see if the PCM is switching the ground to the relay. If it does not, check that wire at the PCM connector. If it switches there, you have an open between the PCM and the relay.
Common problems with this vehicle: Poor ground at for the relay, bad relay, bad ground for the engine coolant temp sensor.

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Where can I get a cooling fan wiring diagram?


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I have a 1999 Alero 3.4 V6 the cooling fans won't run. I checked the fans they both work if I unplug the harness for the temp sensor,the relays and fuses are fine,I replaced the coolant temp sensor and...


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How do i check the cooling fan my car is over heating


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I have replaced the cooling fan relay 3 times in the past 4 months and it needs replaced again. How can i solve this problem?


Sounds like the Cooling fan motor may be seizing up when it gets hot causing the relay to fail, try replacing the fan motor & relay.

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2 Answers

The fans do not work and the vehicle starts to over heat


With mechanical fans, most overheating problems are caused by a faulty fan clutch - though a missing fan shroud can reduce the fan’s cooling effectiveness by as much as 50 percent (depending on the fan’s distance from the radiator), which may be enough to cause the engine to overheat in hot weather or when working hard.

Defective fan clutches are a common and often overlooked cause of overheating. The shear characteristics of the clutch fluid gradually deteriorates over time, with an average loss in drive efficiency of about 200 rpm per year. Eventually slippage reaches the point where effective cooling is no longer possible and overheating results. (On average, the life of a fan clutch is about the same as a water pump. If one needs to be replaced, the other usually does too.)


If the fan clutch shows signs of fluid leakage (oily streaks radiating outward from the hub of the clutch), spins freely with little or no resistance when the engine is off or wobbles when the fan is pushed in or out, it needs to be replaced.


With an electric cooling fan, check to see that the fan cycles on when the engine gets hot and when the air conditioner is on. If the fan fails to come on, check the fan motor wiring connections, relay and temperature sensor. Try jumping the fan directly to the battery. If it runs, the problem is in the wiring, relay or sensor. If it fails to run, the fan motor is bad and needs replaced.

Hope help with this.

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Hi,

Fan Relay switch is stuck open. This of course assumes your temperature sensor is working appropriately. Which I assumed since you seem to know that the engine is running hot.

Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.

Until you get the relay switch replaced, you can either by-pass the relay switch and directly connect the fans to the battery, or turn on your A/C ALL the time and use it at a minimum setting. This will keep the cooling fans running at all times.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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