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Old 08-31-2017, 02:26 PM
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Temperature Control Issues

Good day all. I wanted to get some input on some problems I'm having with my 2012 JK.

I live in Houston, so it's been kind of crap week. Long story short, I had to drive through some high water to get home on Sunday morning. Shortly afterward, while idling in a parking lot with the A/C on, my jeep began to overheat. I was able to allow it to cool enough to make the half mile drive home and the temp gauge started to climb to the 3/4 area as I shut her down in my driveway.

The next day, I hosed the radiator fan motor with some wd40 . Seemed to run fine for about 4 miles then the temp began to rise past the half mark again. Rewind about a year ago, I was getting occasional p0128 codes that seemed to clear on their own and finally stopped happening all together.

Today I replaced the t-stat and the vehicle seems to stay cool. However, my A/C starts cold, but then turns to crap in a matter of seconds. Should I be looking at the fan motor being compromised or do any of you have other suggestions?

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Old 09-01-2017, 01:37 PM   #2
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Hose down the radiator, clean the core. You may have picked up some dirt and debries driving through the water.

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Old 09-01-2017, 01:59 PM   #3
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Have you verified that your fan is working?

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Old 09-02-2017, 09:43 AM
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Ahh... so I removed the overflow bottle and airbox/intake and can see that my fan isn't running. I fired up the A/C to see if I could get it to start and nothing. It spins freely, so I don't think anything is binding it up. The fuse looks good. I'll test the relay and spray everything out for good measure before I look at replacing the fan. I do notice that once the engine gets up to temp, it begins to overheat when idling, but cools back down once I get back up to speed. The fan/shroud/enclosure is like 400-600 bucks and I can't seem to find a suitable aftermarket replacement :S

Thanks guys
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Old 09-02-2017, 10:01 AM   #5
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I thought the fan on our JKs turn on only when the engine temp reaches 209 degrees.
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Old 09-02-2017, 11:12 PM
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I was under the impression that it will also kick on to cool the A/C compressor.
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Old 09-04-2017, 01:17 AM   #7
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Quote:
Originally Posted by Keiff View Post
I was under the impression that it will also kick on to cool the A/C compressor.
Not the compressor, but rather the condenser. Without air moving through your condenser your AC will behave just like you described.

Other than that, you are correct, a new fan is needed. In the meantime I'm sure you know better not to drive like this.
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Old 09-14-2017, 03:36 PM
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Stealership says that my fan shorted, which somehow fried my TIPM (either BS or a really poor electrical design). $2450 parts and labor to fix. Had it just been the fan assembly, I would have eaten the cost. Being the above ridiculous amount, I filed a comp claim with my insurance.

This is from going 3 mph through 20" of standing water. Trail-rated my ass.
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Old 09-14-2017, 03:46 PM   #9
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You can buy a new TIPM yourself for relatively cheap on any of the MOPAR parts websites, if it was indeed bad. Not sure that is true that it was, but not sure how you could check, either.

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