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  #1  
Old 10-14-2015, 10:39 AM
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Overheats Towing

2011 3.6 WK2 Laredo, 5000# tow package. Bought new. Will not tow 3500# boat trailer over Guadalupe Pass in NM; overheats and goes into limp mode. Changed out thermostat. Changed out single row radiator for two row radiator. No improvement. Had dealer burb system. No improvement. Anyone have any magic bullets, or is this a design defect?? Help!!

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Old 10-14-2015, 03:24 PM
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Water pump OK? Tried running with no thermostat yet?
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Old 10-14-2015, 11:02 PM
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Re: Overheats Towing

No water pump leaks. No foamy oil, and no discoloration or loss of coolant. Haven't yet run it w/o thermostat. I can see the thermostat cycling between 199 & 206 during normal driving. Water temp went to 220 over a small hill in Hot Springs AR when towing. I even tried running E85 to see if it would run cooler over Guadalupe Pass. No change. I have the old style heads. Did they improve cooling for the redesigned heads??
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Old 10-15-2015, 08:58 AM
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Re: Overheats Towing

Although the v6 is rated for 5k towing capacity, 3500lbs for a v6 is a lot when you start climbing mountains. The 5k rating is based on perfect conditions with no added load of climbing. You might be pushing it beyond the ability it has. I assume you don't have any towing package.
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Old 10-15-2015, 09:11 AM
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Re: Overheats Towing

He mentions in the original post:

"2011 3.6 WK2 Laredo, 5000# tow package. Bought new."

So I'm going to guess the vehicle has the tow package.

Unless he had the dealer add the tow package to it before he picked it up?

What is generally included in a tow package?
Engine oil cooler
Larger radiator/tranny cooler
Receiver hitch
Sometimes equipped with load leveling shocks
Electrical connections.
Higher Amperage alternator.

Not sure if I'm missing anything.

Also, OP what outside temps were you dealing with when towing?
220F is not abnormally hot for coolant unless the engine is designed to run far less.

Things that could cause cooling problems:
Coolant level.
Air in cooling system. (air bound)
Water pump on it's way out
Improper thermostat operation (stuck)
Unbearable outside temperatures pulling a substantial load uphill in New Mexico.
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Old 10-15-2015, 10:35 AM
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Re: Overheats Towing

Are you down shifting to a lower gear? Granted, my GC is different but when towing over 5000 lbs up a hill I keep the RPM above 3000. It sounds counter intuitive but higher engine speed moves more coolant and increases heat evacuation.
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Old 10-16-2015, 03:03 AM
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Re: Overheats Towing

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Originally Posted by Capt Bligh View Post
2011 3.6 WK2 Laredo, 5000# tow package. Bought new. Will not tow 3500# boat trailer over Guadalupe Pass in NM; overheats and goes into limp mode. Changed out thermostat. Changed out single row radiator for two row radiator. No improvement. Had dealer burb system. No improvement. Anyone have any magic bullets, or is this a design defect?? Help!!
I've had the same issue with mine towing a boat uphill in high heat. I've read some other stories on it and it appears to be a design issue and it's not cooling properly under load. On the 2014 and up they upgraded the cooling fan and alternator. Ours seems like it doesn't kick on under that load.

http://www.carcomplaints.com/Jeep/Gr...n_towing.shtml

Only way around it is to turn off the ac and run the heater if you get to that point of limp mode. Been there and it sucks.

I took mine in and got the standard response no trouble codes, and I'm expecting too much out of it. Funny how they marketed 5k towing capacity but it can't keep up on inclines.

To be honest though it was a challenge keeping up speed unless I was running in 2nd. Not enough low end torque on the v6 and the 5 speed. Flat land was perfect. I was only towing about 40 miles each way so I made it work.
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Old 10-16-2015, 09:47 AM
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Re: Overheats Towing

Towing package is factory, on the window sticker. Temp goes to 249 then car goes to limp mode over Guadalupe Pass, even when slowing down and downshifting. Pass is 7 miles of 7% grade, temps typically mid 80's to 105. Typical SW Desert. None of my other tow vehicles have had this problem. I was hoping maybe a cylinder head redesign on later engines to fix problem. Thx to all for the input.
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Old 10-16-2015, 11:05 AM
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Re: Overheats Towing

It's not counterintuitive to have the trans in a lower gear and rpm's at or above 3000. Forget the coolant movement which is a plus, the 3.6 pentastar makes approximately 100hp at 2000rpm, 150hp at 3200rpm, 200hp at 4200rpm. The magic quoted 280-290hp number comes very briefly above 6000rpm, I see it daily but this is more a 150-200hp engine at best for most drivers. At sea level that seems like a good enough reason, at 5000' that'd be approx 25hp less. Ever pull a 3500# trailer behind a 5k Jeep with 115hp? assuming your at 2500rpm? I think the jeep would likely have been around 3200, barely 125. Now add in a decent grade and it's a push. Even though the pentastars tqe curve is beautifully flat and pretty decent it's not what it should be for towing up a hill. Around town at Florida height it's quite fun, but I don't even like boat ramps. 7* at 11' elevation I get dizzy.

There is still something actually wrong with your jeep because even pissed off my giant marshmallow wouldn't go into limp mode with that workout just once, provided it's in good nik. I'd replace every fluid after those temps even the washer just to make her feel better. If you can't identify any physical defects or stuck parts I'd go this route. I like current mopar products down to oil filters , no additives and start from there. All numbers are approximately approximate.
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Old 10-19-2015, 12:30 PM
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Re: Overheats Towing

I'd start with synthetic oil, "water wetter", and a 180F thermostat. Agree the Pentastar likes more revs than a Hemi or Diesel.

I also use Torgue Pro, a dongle, and a 7" Android tab to monitor a lot more parameters. What you want to do is to keep it out of PE (performance enrichment) mode except for short bursts and not a 7/7 grind. It does like what seem to be high revs - 3500-4500 and has a very flat torque curve. Are you climbing in 2nd gear (55 mph = 4100 rpm) ?

May make some mad but HP really only matters for accelleration. Torque is what climbs a hill and the lower the gear the more torque goes to the pavement.

BTW my '12 also has the tow package but with 2WD you did not get much, just the hitch, wiring, and a full sized spare.
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Old 10-19-2015, 02:39 PM
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Re: Overheats Towing

If it's the water temp, then downshifting is your first answer after you've swapped coolants etc.
If you are sure your radiator is not gummed up or your fins mashed together, your only option is a larger radiator and/or fan. Large high rpm electric fan is easiest fix as you can set the fan t-stat to come on at a particular temp. Next step is a larger 3-core radiator. If you want to hit it with a hammer and be done with the problem, then big radiator.
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Old 10-19-2015, 09:07 PM
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Re: Overheats Towing

Hemi radiator fits.
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