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  #1  
Old 08-27-2016, 11:04 AM
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2012 Jeep Grand overheating

I have a 2012 Jeep Grand Cherokee with the 3.6l. The Jeep started overheating with the A/C on. Turn off the A/C and turn on the heat it goes back down to normal. The temp has made the light come on twice. Temps range from 230 to 260. I have replaced the fan relay and still overheats. What else could be wrong, the fan?

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Old 08-27-2016, 04:18 PM
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Re: 2012 Jeep Grand overheating

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Originally Posted by Iamthest View Post
I have a 2012 Jeep Grand Cherokee with the 3.6l. The Jeep started overheating with the A/C on. Turn off the A/C and turn on the heat it goes back down to normal. The temp has made the light come on twice. Temps range from 230 to 260. I have replaced the fan relay and still overheats. What else could be wrong, the fan?
Either water pump thermostat or Electric fan is not kicking up as it should.

230 is still hot for the 3.6 I believe the Stock is 212.
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Old 08-27-2016, 09:48 PM
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Re: 2012 Jeep Grand overheating

I'd say some sort of radiator problem.
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Old 08-30-2016, 01:16 PM
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Re: 2012 Jeep Grand overheating

At idle the GC will sit at 230 with A/C on but when driving with A/C off it will overheat. Turn heater on full blast while driving, the temp will come back down to 230. At idle fan will cycle low and high. Thermostat?
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Old 08-30-2016, 03:24 PM
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Re: 2012 Jeep Grand overheating

I've seen alot of 3.6l thermostats stick open, but that wouldn't cause an overheat condition. Regardless, can't rule out a thermostat that has stuck closed. It's a simple job to replace the thermostat/housing assembly but make sure to bleed the air from the system during the refill process.

With the fan switching, it sounds like it's doing exactly what it's supposed to do. Running low speed during normal operating temps and then switching to Nor Easter mode during excessive temps in hopes to force cool down.

Ever had to add any engine coolant or have you had to previously open the cooling system for any reason?
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Old 08-30-2016, 08:11 PM
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Re: 2012 Jeep Grand overheating

No. Haven't opened the system at all. Being a 2012 I wouldn't think I would already have to work on it.
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Old 08-30-2016, 08:14 PM
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Re: 2012 Jeep Grand overheating

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Originally Posted by Iamthest View Post
No. Haven't open the system at all. Being a 2012 I wouldn't think I would already have to work on it.

You would be surprised. As I mentioned earlier, the 3.6's have had a rash of thermostats that have been sticky. I've seen them fail at 40K miles and upwards. Even had both mine and my sisters thermostat fail at less than 50K.
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Old 08-30-2016, 09:13 PM
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Re: 2012 Jeep Grand overheating

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Originally Posted by Iamthest View Post
No. Haven't opened the system at all. Being a 2012 I wouldn't think I would already have to work on it.
I would Guess thermostat, not overheating with A/C on idle kinda odd normally forces the fan to run in high mode tho.

I would change thermostat, Then water pump.

Water pump is covered under the 5yr/100k Powertrain but you better hurry 2017 is coming!

If your good with your dealer they might just charge a fee for the thermostat and do the water pump same time.
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Old 08-30-2016, 10:49 PM
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Re: 2012 Jeep Grand overheating

Hey Bud,
I had the same issue with my 2011 3.6 GC . Now that being said you can do a process of elimination so you don't spend money on stuff you don't need. I got my coolant temp sensor changed thinking it was that but it wasn't ( read somewhere that they have issues on another forum site) Anyway with that part eliminated because it's a bitch to replace on these motors supposedly I decided to check my cooling fan. First I check to see if it turns on without load ( ac on ) No such luck. Then I put a/c on and still nothing. So I decided to buy a 15 dollar led test light from the auto parts store. I unplugged the connector that is located on the passenger side on the fan . there will be 3 pins to test with the vehicle running with a/c on. Have the test light hooked to ground and test them You should have 2 that power up and one that shows ground. ( this is just to make sure you have power to the fan ) If you have no power coming to the connector you may have an issue with the relay or worse case scenario the tipm. Anyway I found my fan was my issue . I replaced it and BAM!!! no more overheating . Now that being said you may have a thermostat issue but I would assume that thermostat would throw a code but I could be wrong as GC's are in a category of there own :P
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Old 08-31-2016, 09:04 AM
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Re: 2012 Jeep Grand overheating

It is not throwing any codes. The fan works on low and I can hear the fan switch to high when it starts to overheat. Time to replace the thermostat and see if that does it.
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Old 09-01-2016, 10:04 AM
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Re: 2012 Jeep Grand overheating

Replaced thermostat and the GC is sitting at 208 with A/C on. Thanks for all the help.
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