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  #85  
Old 08-01-2014, 10:30 AM
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Re: Towing Review//Engine Heat

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Originally Posted by Mike V View Post
Mine has the HD tow package. The dealer called yesterday and said they have an computer update for the AC, lets see if it is higher set point for the compressor or lower set point for fan... Should know today.

Thanks, Mike V
Hopefully, it's a lower setpoint for the cooling fan. Would be interested to know what codes were set when you had the MIL light incidents.

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  #86  
Old 08-01-2014, 11:33 AM
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Re: Towing Review//Engine Heat

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Originally Posted by philbytx View Post
FYI - The VM Motori diesel does not have a viscous coupled fan on the motor, just a large electrically operated fan.
After some more digging, I found this answer from Jeep engineering to a question on what kind of fan the Ram 1500 Ecodiesel pickup used:

Quote:
Bob Hegbloom, Director of Ram Truck Brand and Mike Cairns, Director of Ram Truck Engineering answered questions in an open Google+ Hangout on June 12, 2014.
"Electric or mechanical cooling fan?"
- 800 watt electric fan that can operate at variable speed.

Pretty efficient cooling when they can use about 1 hp of electric cooling on a 1500 Ram pickup truck. At 14 volts, thats about 57 amps of power being used by the fan at peak levels, so it doesn't seem likely that they can increase the fan speed by very much.

I did read one review of the Ram 1500 Ecodiesel where during towing 5000 lbs at high altitude the coolant gauge reached 244*F shortly before the summit. IIRC, it was Diesel World or DP magazine.

I see the good news is that with both the Ram 1500 and GC using an electric cooling fan design on the same engine, there should be enough engineering attention from the Ram/Jeep team to address the calibration issues.
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  #87  
Old 08-04-2014, 05:22 PM
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Re: 3200 mile tow vacation.

UPDATE: The check engine light code was for knocks. Dealer said sometimes on a new combination the sensors are set to tight. The update should stop this and it was when I wasn't towing.

Temps are normal, thou they have had others complain about the same thing. Told me the thermostat does not open until coolant temp is over 220.

The air con problem was because it froze up so the key is to turn it down if I stop and run it on recirc to help that condition.

Mike





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Originally Posted by Mike V View Post
My trailer is a 19' Pioneer that weighs about 5500 loaded. The trip started in Lake Havasu, AZ early in the morning so had no heat issues. Once in Oregon we went up to Crater Lake and other grades. The highest temps I saw was 262 oil, and 202 trans. Like everyone else I think the readings are scaled. The temps go up and down to quickly for my experience.
I had a check engine light come on steady so took it to the local dealer in Coos Bend. Since there was not grades and the OAT was cool I assumed it was not related to heat. After three starts the light went out and since it was a weekend I continued my vacation. On the last 150 miles back to AZ, we were traveling down I-40 from Barstow to Needles and the air conditioning got warm like the compressor had stopped. I know the compressor will kick out at a certain temp so I pulled over and waited until the engine oil came down to about 210 and tuned the engine off for a moment to reset everything and the air came back on. Problem continued.
Took the car to the dealer next day. They are checking everything.

The BIG news is this:

1st. The PCM can not be programed by the dealer. So we can't have the fans come on early. I told them that GM products can be modified.

2nd. The cooling capacity for the 3.0 diesel is 12 quarts total.
The cooling capacity for the 5.7 hemi is 16 quarts with the tow package.

I don't know if the difference is in the block or the radiator. I tried to get the rad capacity but didn't have the time to wait as the parts guy was new or slow. If someone has a friend at a dealership, it would be great to do a side by side comparison of the two. This may be our answer.

3rd. The service writer said that he has had 3 others with the same complaint about heat while towing.

Hope this helps. When I get the car back tomorrow I Will follow up on the check engine light and other info.

Mike V
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  #88  
Old 08-04-2014, 05:39 PM
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Re: 3200 mile tow vacation.

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Originally Posted by Mike V View Post
UPDATE: The check engine light code was for knocks. Dealer said sometimes on a new combination the sensors are set to tight. The update should stop this and it was when I wasn't towing.
Knocks? Seriously? If they are referring to detonation, that's crap. Diesels operate BECAUSE they detonate. Hopefully the flash fixes any random CEL conditions but it won't solve the "knocking" in your diesel!
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Old 08-05-2014, 12:15 AM
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Re: Towing Review//Engine Heat

NOx. Nitrogen Oxide.
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  #90  
Old 08-05-2014, 12:41 AM
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Re: Towing Review//Engine Heat

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Originally Posted by Wiley75 View Post
NOx. Nitrogen Oxide.
Ah....NOx issues. Makes sense. Thanks.
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  #91  
Old 08-05-2014, 08:55 AM
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Re: 3200 mile tow vacation.

Situations like this one make a code reader worth its weight in gold. You can read the codes before you take it in and be sure they address every symptom.


Quote:
Originally Posted by Mike V View Post
UPDATE: The check engine light code was for knocks. Dealer said sometimes on a new combination the sensors are set to tight. The update should stop this and it was when I wasn't towing.

Temps are normal, thou they have had others complain about the same thing. Told me the thermostat does not open until coolant temp is over 220.

The air con problem was because it froze up so the key is to turn it down if I stop and run it on recirc to help that condition.

Mike
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Old 08-05-2014, 09:01 PM
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Re: Towing Review//Engine Heat

Hammerhead I think the big concern occurs on grades. I was driving to Big Bear recently at temps of 112 degrees on the flat. Going up Hwy 18 which is an 18%+ grade in many places the gauge climbed near Hot but when I put my foot in it and kicked up the RPM's it held or reduced. Oil temp went to 240, trans to 200 degrees. I think that a fan clutch or rad. fan may have kicked in. In the past I have towed my Kubota tractor on a 2 ax trailer up the grade with my Ford F-250 7.3 diesel in the summer and while the engine stayed cool the trans temp climbed a little but as soon as I stood on it the RPM's caused the trans temp gauge to drop back into the operating range. Additional: I noticed that my engine oil at 5K is absolutely black but it still shows 37% oil life remains. We should trust the engineers I think and while I may not drive it to 10K to change the oil I trust the technology to maintain the system within operating ranges. Diesel's run good while hot anyway. Good Luck and keep us posted.
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