Heater performance in cold weather - Dodge Cummins Diesel Forum
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post #1 of 26 (permalink) Old 01-18-2020, 01:13 PM Thread Starter
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Heater performance in cold weather

So I think I found out why RAM started installing electric supplemental heaters in their trucks for "free" starting in 2019...the engine doesn't warm up, nor stay warmed up, as well.

The much larger radiator in the 2019 needed to cool the higher output creates an overcooling situation. I would have thought the grille shutters would solve the problem, but apparently not.

It was 0F this morning, not extremely cold, but cold. I drove 25 minutes on mostly 50 mph roads without much in the way of hills...and noticed when I got to my destination the reported coolant temp was only about 170F. Oil temp (whether accurate or not) was even less at 150F.

The heat was fine, but I suspect the supplemental electric heater was working the whole time.

I drove this same route in my 2018 many times with the coolant reaching 190 very quickly.

Anyone else in the cold weather noticing this?


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post #2 of 26 (permalink) Old 01-18-2020, 02:44 PM
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Quote:
Originally Posted by troverman View Post
So I think I found out why RAM started installing electric supplemental heaters in their trucks for "free" starting in 2019...the engine doesn't warm up, nor stay warmed up, as well.

The much larger radiator in the 2019 needed to cool the higher output creates an overcooling situation. I would have thought the grille shutters would solve the problem, but apparently not.

It was 0F this morning, not extremely cold, but cold. I drove 25 minutes on mostly 50 mph roads without much in the way of hills...and noticed when I got to my destination the reported coolant temp was only about 170F. Oil temp (whether accurate or not) was even less at 150F.

The heat was fine, but I suspect the supplemental electric heater was working the whole time.

I drove this same route in my 2018 many times with the coolant reaching 190 very quickly.

Anyone else in the cold weather noticing this?
Can you post up what the total cooling system capacity is on your 2019?

My 2018 was 5.7 gallons.....going off memory.

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post #3 of 26 (permalink) Old 01-18-2020, 02:54 PM Thread Starter
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Can you post up what the total cooling system capacity is on your 2019?

My 2018 was 5.7 gallons.....going off memory.
It is 5.625 gallons, which you knew.

I guess the more I think of it, radiator size doesn't matter since when the engine is cold the thermostat is closed, other than more air coming in through the larger opening (unless the shutters are closed).

However, something definitely seems to be different, given how the truck did not warm up.
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post #4 of 26 (permalink) Old 01-18-2020, 02:54 PM
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2019/20 coolant capacity is the same 5.7 gallons.
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post #5 of 26 (permalink) Old 01-18-2020, 03:03 PM
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Quote:
Originally Posted by troverman View Post
It is 5.625 gallons, which you knew.

I guess the more I think of it, radiator size doesn't matter since when the engine is cold the thermostat is closed, other than more air coming in through the larger opening (unless the shutters are closed).

However, something definitely seems to be different, given how the truck did not warm up.
I didn’t know......since your previous truck was a 2018, I took your statement verbatim that the 2019 trucks had bigger radiators.....which would/should generally indicate additional cooling capacity, even if it were .2 or .4 gallon increase.

2018 RAM 4500 Chassis Tradesman Crew Cab 60” C/A 4WD, 6.7L Cummins, AISIN AS69RC Transmission, 4.10 Axle Ratio, Chrome Appearance Group, Keyless Entry, Fog Lamps, Chrome Tubular Steps, 52+22 gallon fuel tanks, 5.0 Radio, Single Disc CD Player, 225/70R19.5 Firestone FD690’s, Aluminum Wheels, Parkview Backup Camera, Trailer Brake Controller. Equipped with a CM SK Series flatbed w/B&W Turnover Ball. Purchased new April 23, 2018. Currently : 196,704 miles and 3,437 hours as of January 27th, 2020 (Average Miles Per Hour = 57.2)
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post #6 of 26 (permalink) Old 01-18-2020, 04:04 PM
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Quote:
Originally Posted by gsbrockman View Post
Can you post up what the total cooling system capacity is on your 2019?

My 2018 was 5.7 gallons.....going off memory.
You don't have the 2018 anymore? I saw your "FOMOCO FTW" the other day. Are you in a Ford now?

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post #7 of 26 (permalink) Old 01-18-2020, 07:14 PM
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gsbrokman say it ain't so...
As for the radiator and cooling, the radiators are bigger for the 19+. My temp gauge seems to get warmer a little quicker than my 13, but I am in a 2500.
And the electrical supplemental heaters are the best.

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post #8 of 26 (permalink) Old 01-18-2020, 09:43 PM
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You don't have the 2018 anymore? I saw your "FOMOCO FTW" the other day. Are you in a Ford now?
All is well.....still in my 2018 RAM 4500.

I was being sarcastic with the “FoMoCo FTW”

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post #9 of 26 (permalink) Old 01-19-2020, 03:12 AM
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I've been down to temps as low as -35F so far. I regularly see temps in excess of 180F and oil temps nearly that high. This is without a weather front installed either.

I've sat in the truck when the electric heat kicks in. It's a bit of heat, but it's not a huge amount. Certainly not enough to keep the cab heated when the temps are really cold and you are moving. These new 6.7's build heat quickly.

Today was -24F and I didn't even plug the truck in (too far from cord last night). Fired right up. I got the automatic regeneration notice as soon as I left the house. Decided it was a good day for a little drive, so I drove 40 miles to see a friend and have a cup of coffee. Zero issues making heat.

It'll be that cold again tomorrow, I'll be taking another 40 mile run. I'll keep an eye on it and make more detailed observations.
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post #10 of 26 (permalink) Old 01-19-2020, 03:15 AM
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BTW.. if you suspect your electric heat is doing all the work, the simple way to find out would be to unplug the fuse. I bet it's not doing as much as you think.
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post #11 of 26 (permalink) Old 01-19-2020, 07:08 AM Thread Starter
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Glad you replied DougAK...was hoping to hear your observations. Maybe I was just not working mine hard enough.

We’ve got -10F coming up, will observe again.

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post #12 of 26 (permalink) Old 01-19-2020, 09:55 PM
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Heater performance in cold weather

Today started at -24F. Truck thermometer is a consistent 2F warmer than the state thermometer next to me. First photo is 15min after starting the truck, not plugged in.
Next photo is 4 miles down the highway at my other shop picking up parts for a project at my home shop temp dropped from 181F before I could take a pic.
This photo is one mile down the road, I pulled over to catch it.

Final pic is after the thermostat opened and temp settled. I’ve driven 90 miles total today and temps have stayed at 185 steady.

Moose at my store, licking salt off a customer’s truck.

Sent from my iPhone using Tapatalk
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