Fast heat?

[Prairie Dog]

I have a 2015 Challenger SRT and one of the most remarkable things about it is how fast it makes heat. Within 30~45 seconds it putting out low level heat. Within 2 minutes it's pouring out! I don't understand how it can do this unless there's some electric heating going on.
My question is for you guys with some of the newest RAMs, Do your trucks make heat that fast?

Takes my third gen about 10 minutes.

Thanks in advance,
Scott

 

[nukegm]

yes. my 18 ctd makes heat quick. either plug it in, or idle for 5 minutes with exhaust brake on. heat within 5 miles. unlike my 02. 20 miles until heat. cheers!

 

[nukegm]

2018 ram diesel makes heat in 5 minutes if its plugged in and cold out. idle it in driveway for 5 minutes with exhaust brake on , also makes heat quickly. much better than my 02 2500. it takes 12 miles to kinda make heat - f y i all downhill from my home to work. cheers!

 

[AH64ID]

With the EGR cooler my ‘18 heats up much faster than my ‘05, but it’s still not fast. Diesels are slow to warm up. At least the seat and steering wheel are heated, and that makes a huge difference. I prefer not to idle it to warm it up.

My brothers F-250 has the electric rapid heat and he said he can feel it, but it’s nothing to write home about.

 

[Prairie Dog]

Thanks for the responses. Still wonder how my Challenger does it so fast.
My first gen took forever and in some cases, just didn't make any.
I was driving it down the freeway in Kansas at sub-zero temps and empty. The eng just wouldn't make any heat. I could see my breath and even wearing a snowmobile suit and hat, I was slowly freezing!

Nice to know the new ones do better than my 3rd gen.

Does Ram offer anything like the Rapid Heat John described?

S

 

[AH64ID]

The challenger is an all aluminum gas engine. Between gas and aluminum there is a lot more heat to push to the heater core.

I haven’t heard of any electrical supplemental heat for Ram.

My 05 was the coldest blooded rig I’ve ever driven. It did have a high flow cam, high flow turbine, no 3rd injection event, and a coolant heater thou. On a 0° day, or colder, driving empty to work it could take 16-18 miles to get the thermostat to open with a winter front installed. It would then blow HOT air even in the -30°’s, it just took a long time to warm up.

 

[Prairie Dog]

The challenger is an all aluminum gas engine. Between gas and aluminum there is a lot more heat to push to the heater core.

I haven’t heard of any electrical supplemental heat for Ram.

My 05 was the coldest blooded rig I’ve ever driven. It did have a high flow cam, high flow turbine, no 3rd injection event, and a coolant heater thou. On a 0° day, or colder, driving empty to work it could take 16-18 miles to get the thermostat to open with a winter front installed. It would then blow HOT air even in the -30°’s, it just took a long time to warm up.

Actually, all the V8's in Challengers are cast iron with alum. heads. One of the reasons they're so frigin heavy compared to Mustangs.
Of course, the 392 is still faster than the 5.0

 

[AH64ID]

Actually, all the V8's in Challengers are cast iron with alum. heads. One of the reasons they're so frigin heavy compared to Mustangs.
Of course, the 392 is still faster than the 5.0

Gotcha. Even just aluminum heads will make a huge difference in heat transfer as most engine heat is expelled thru the heads.

 

[mweiman]

It is impressive how fast some of the newer vehicles warm up. Our 2017 Pacifica on all but the coldest days will be at full operating temp in a mile. Parked in a garage that’s 40 degrees or so.

 

[kthaxton]

Do Challengers have electric fans? I know that vehicles with electric fans warm up a lot quicker since the fan can be completely off until needed.

 

[Bob4x4]

Many FCA gas vehicles have heaters to get the trans fluid up to temp quickly.

 

[Prairie Dog]

Do Challengers have electric fans? I know that vehicles with electric fans warm up a lot quicker since the fan can be completely off until needed.

Yes, they do!
The amount of heat it pumps out around the eng compartment is amazing. My wife comes home and you can hardly stand next to the front wheels because so much heat is pouring out.
I have a 60's vintage Ford with the same size eng and the oposite problem; can't get the heat out of the eng bay fast enough.

 

[CAROLINA CUMMINS]

Coming from a cold running 12 Valve my '14 makes heat insanely fast. Pretty happy about that, wife even more so

 

[Wiredawg]

My 2014 Jeep Wrangler makes heat faster than anything I've owned. Electric fan not running helps a bunch. Aluminum block helps too.

The diesels have a LOT of oil and a LOT of coolant to warm up, and the 4th gens with bigger radiators doesn't help. See efficient cooling has tradeoffs.

Cheers, Ron

 

[AH64ID]

the 4th gens with bigger radiators doesn't help. See efficient cooling has tradeoffs.

My 4th gen has a smaller cooling system than my 3rd gen did. 5.7 gallons on the '18 vs 7 gallons on the 05.

If the radiator is bigger, where did it lose 1.3 gallons of coolant to? There is also the EGR cooler that holds coolant.

Or does the block hold that much less coolant?

 

[Wiredawg]

I could

My 4th gen has a smaller cooling system than my 3rd gen did. 5.7 gallons on the '18 vs 7 gallons on the 05.

If the radiator is bigger, where did it lose 1.3 gallons of coolant to? There is also the EGR cooler that holds coolant.

Or does the block hold that much less coolant?

Duh, I Can't explain it and don't know how Ram gets more efficient cooling, especially given the smaller amount of coolant you pointed out. I never checked cuz changing coolant on my 17 is long way off. I suspected it held more, given the plumbing going to the coolant fill tank located at the back of the engine. The cooling is way more efficient on my 17 than on my former 03 2500, and on my former 09 4500. Bigger cooling fan? Better engine oil cooling that translates to lower engine temps? Can't be less coolant in the engine, can it? I know on the 19s, per a Ram video I saw, is they built the truck around the radiator.

Cheers, Ron

 

[AH64ID]

So I did a little research. The 07 5.9 and 6.7 use the same radiator, but have the 7.0 vs 5.7 gallon systems. It seems to me the 6.7 just holds less in the block.

My 05 would run cooler for a given load than my 18 does, but the 18’s fan is noticeably stronger. That’s all after I reprogrammed the fan on the 05, that made a HUGE difference for me. Dropped my hill pulling temps by 6-8°.

The 18 also takes much longer for coolant temps to drop after towing. I attribute that to the EGR cooler.

 

[Wiredawg]

So I did a little research. The 07 5.9 and 6.7 use the same radiator, but have the 7.0 vs 5.7 gallon systems. It seems to me the 6.7 just holds less in the block.

My 05 would run cooler for a given load than my 18 does, but the 18’s fan is noticeably stronger. That’s all after I reprogrammed the fan on the 05, that made a HUGE difference for me. Dropped my hill pulling temps by 6-8°.

The 18 also takes much longer for coolant temps to drop after towing. I attribute that to the EGR cooler.

My 17 5500 runs significantly cooler 34K lbs GVW 100'F steep grades than my 09 4500, slightly higher weight and same conditions. the 4500 would be running right below the red zone on the temp gauge and the 5500 never shows warmer than normal. I swapped radiators from my 09 4500 to my 03 2500 when the 2500 radiator developed a leak and upgraded the 09 4500 radiator. I saw the same on transmission temps too, so I installed a thermostat operated fan cooled aux transmission coolers on my 4500 to get temps down.

The amazing coolant and transmission cooling on my 2017 are big plusses on the upgrade from my 09 4500.

EDIT: Is it possible the 4th Gens radiators have larger surface area and larger cooling fan, but smaller coolant capacity? Hard to believe block holds less. Be nice if one of the members who works on these a lot could share...can't find how much the radiators hold or the blocks.​

Just thought I would mention I had a 02 Ram 3500 4x4 6spd 4.10s I was towing an 18KLb triple axle Travel Supreme that I literally drove by the EGT and coolant temp gauges. I got my most significant cooling improvement by adding an additional engine oil cooler with valves to bypass in winter or when not loaded. Cooling the engine oil helped drop as much as 20'F off the engine coolant temp. I was sooo overloaded on everything except axles and tires on that truck.

Anyhoo, very interesting that Cummins and Ram are getting MORE cooling, at least in my case, with less coolant. I couldn't be happier with my rig...of all the Ram Cummins trucks I've owned, my 2017 is the most capable. My 02 was my favorite for looks and sound!.

Cheers, Ron

 

[sag2]

Diesel engines heat up more slowly than gas because more of the energy content of the fuel is converted to rotational energy, and less to heat that is wasted through the exhaust or cooling system. There is also considerably more mass to heat up. My 18 does heat up considerably faster than the 5.9 trucks I had as company cars.

 

[HPSimpson]

I have '19 2500 that has as a option, additional system of heating is offered that is activated in the first instants of operation of the engine, according to the temperature of engine coolant by the HVAC module when requested by the A/C heater control. The cabin heater consists of a Positive Temperature Coefficient device for additional heating located inside the heater assemble, there are three resistors: PTC1 is 400w, PTC2 is 400w, and PTC3 is 400w, the truck warms up real fast!
This is standard on Cummins diesel engine!