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  #1  
Old 09-04-2014, 05:02 PM
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Overheating?

About to post a trip report on my first long-distance excursion in the diesel, but thought I'd post up a question about how hot all your 3.0's run. While coming home from our trip, we were heading southbound on California's Interstate 5. When we arrived at an area called the Grapevine, we started our winding crawl up the mountain from about 1500 ft elevation to about 4200 feet elevation. It wasn't overly hot for California, but it was in the low- to mid-90's on the valley floor, and just below 90 at the top of the pass.

As we headed up the pass, we saw the typical old cars and overloaded cars, trailers, and SUVs pulled over on the side overheated. Hoods up. People staring at steam rising out of their radiator.

As we continued our climb, I noticed that our temp gauge started climbing as well. No big deal. Then it really started to get high. Hmmm. Then it settled down right below the red (orange?) mark near the top of the temp gauge. At that point, I stopped traveling at 70mph and pulled over a couple lanes and dropped in to a slower pace. Temps came back down. By the time I hit and was over the pass, it was back at about mid-level or lower on the gauge.

So, gurus, would I have overheated had I kept it up? Did I have anything to worry about? Should I have been more cautious from the getgo?

As an aside, I was carrying our Thule roof box, four bikes, a load of camping supplies in the back, and my wife and child.

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Old 09-04-2014, 05:11 PM
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Re: Overheating?

From what I have been reading on here a lot of people are experiencing the same thing but never actually tip into the red zone. It seems to be a combination of a weird scaling on the temp guage and the fact that the thermostat doesn't fully open till you are almost to the red.
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Old 09-05-2014, 03:55 PM
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Re: Overheating?

This engine is designed to run hot. Look at it this way if there was an issue with overheating the company would be changing over to a cooler algorithm with most likely lower thermostat. My 335 BMW runs in the 245F range as normal for oil temps. I have seen 270F before with no issues.
I think it is an artifact of how the gage is calibrated and unless it is going over 270F I am not going to worry.
I know the guys towing in OZ see these high temps but so far I know of no engine failures from overheat. I think this engine like my BMW engine will go into limp mode before that happens...
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Old 09-05-2014, 07:40 PM
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Re: Overheating?

Climbing Rockies going east on I-70 toward Eisenhower–Johnson Memorial Tunnel I was driving 70 mph on 6 - 7 gear and temp went up but never enter the red zone and the elevation there is above 11000 feet, outside temp was around 80 F. I noticed that if I drop a gear down it will start cooling better (higher rpm/better coolant circulation), oil and trany temp were in norm also.
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Old 09-05-2014, 08:56 PM
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There does seem to be a lot of concern regarding the gauge readings.

However, in the interest of science, perhaps we should flip the question around: has anyone ever experienced an actual overheat that required intervention on an EcoDiesel? If so, under what circumstances?
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Old 09-06-2014, 08:31 AM
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Overheating?

Up here in New England we have the Mt Washington Auto Road in New Hampshire. I drove that in August with my '14 Diesel Summit. It ran hot on the way up then coming down it was just fine. Ran into a problem at the bottom with clouds of smoke coming out of it once back on level ground for about 3-5 miles. Oil, DEF fluid or Diesel is the question of what was burning off from the decent?? Dealer couldn't answer what it was.


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Old 09-06-2014, 12:23 PM
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Re: Overheating?

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Up here in New England we have the Mt Washington Auto Road in New Hampshire. I drove that in August with my '14 Diesel Summit. It ran hot on the way up then coming down it was just fine. Ran into a problem at the bottom with clouds of smoke coming out of it once back on level ground for about 3-5 miles. Oil, DEF fluid or Diesel is the question of what was burning off from the decent?? Dealer couldn't answer what it was.


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Did it smoke from the front or rear of the vehicle? Was it an exhaust smoke? From under the hood maybe? What was the color of the smoke?
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Old 09-06-2014, 12:35 PM
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Re: Overheating?

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Did it smoke from the front or rear of the vehicle? Was it an exhaust smoke? From under the hood maybe? What was the color of the smoke?

It was coming from the exhaust, because once it started the more I got on it the more smoke that came out until it stopped and burned off. Blue in color.

Even my '76 Triumph TR6 going up there and down never smoked like this and they are known for burning oil and leaking it....


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Old 09-06-2014, 02:09 PM
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Re: Overheating?

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Originally Posted by mpetuch View Post
It was coming from the exhaust, because once it started the more I got on it the more smoke that came out until it stopped and burned off. Blue in color.

Even my '76 Triumph TR6 going up there and down never smoked like this and they are known for burning oil and leaking it....


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As you mentioned, blue smoke is usually burning oil. In addition to the general issue of having this on a brand new vehicle, I would also be concerned with what those 5 miles of thick smoke did to your DPF. I might be going there myself before October. I'll let you know if I experienced any issues.
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Old 09-07-2014, 05:11 PM
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Re: Overheating?

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Originally Posted by netboy View Post
As you mentioned, blue smoke is usually burning oil. In addition to the general issue of having this on a brand new vehicle, I would also be concerned with what those 5 miles of thick smoke did to your DPF. I might be going there myself before October. I'll let you know if I experienced any issues.

And just a little bit of more information. I have yet to have the exhaust regeneration notice ever come on in my vehicle in just about 20k miles. Not sure if that's good or not but I have had the vehicle since Dec. 9th 2013.



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Old 09-07-2014, 05:39 PM
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Re: Overheating?

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Originally Posted by mpetuch View Post
And just a little bit of more information. I have yet to have the exhaust regeneration notice ever come on in my vehicle in just about 20k miles. Not sure if that's good or not but I have had the vehicle since Dec. 9th 2013.
Regen notices come only when the vehicle DPF is in distress. Normal operation of the vehicle does not generate any EVIC indication. The only way to determine if you actually regen is by looking at the EGT temps using a OBDII scanner that will skyrocket to 1100F during a regen. When the vehicle was new, I could also smell a regen as the heat radiation from the DPF would cook the new coating around it in the underbody.

Two things I was thinking of that might have caused your issue are:
1. a leaking valve stem seal.
2. Something that caused the crankcase ventilation system to suck large quantity of oil. We don't have a PCV valve, but rather a centrifugal oil separator and a PCV pipe that feeds back to the inlet.

I would go back to the dealer and demand a better answer.
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Old 09-07-2014, 06:44 PM
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The only way to determine if you actually regen is by looking at the EGT temps using a OBDII scanner that will skyrocket to 1100F during a regen.
I'm fairly certain regen shows up as a spike in Cat1Bank1 rather than EGT per se. At least that's how I have seen it: random, ~10 minute spikes of C1B1 temps to 600° C while on open, flat highway. EGT doesn't get that high during the regen.

The only time I have been instructed to do an active regen was a few days after I started using the power-brake/turbo launch to avoid getting caught without power while turning through a busy intersection.
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