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2015 2.4L GT - how hot is too HOT?

19K views 11 replies 8 participants last post by  Oldarter#63  
#1 ·
I have a 2015 GT, 2.4L. 55,000 miles. How hot is too hot? I've contacted the dealership regarding the temp, but they keep telling me that they "run hotter" than normal. What's normal then for the Dart? My gauge is showing up to 228° and it's unnerving, knowing the damage that can easily happen. What are you all seeing in terms of temp - is 220° really "normal"?

Backstory...
In April of 2018 I noticed a strong coolant smell after an oil change, and that's when I started keeping the temp gauge front and center on the dash - and at that time the temp was creeping up to 210. I took it back to the dealer. After checking it over, they said that it wasn't the temperature that concerned them as much as it was the dribble of coolant down the block. They said it wasn't safe to drive the car and kept it for servicing. The comment on the work order reads as this..."REMOVED CYLINDER HEAD, FOUND THAT THE BLOCK TO HEAD DOWEL PIN WAS PUSHED ALL THE WAY UP INTO THE CYLINDER HEAD CAUSING GASKET DAMAGE, WHEN TAKING OFF THE EXHAUST MANIFOLD OFF TWO OF THE BOLTS TOOK ALL THE THREADS IN THE HEAD WITH THEM. TALKED WITH STAR AND THEY STATED TO REPLACE HEAD DUE TO MORE DAMAGE WOULD BE DONE BY TRYING TO REMOVE DOWEL FROM HEAD. REPLACED CYLINDER HEAD AND GASKET AT THIS TIME. I REPLACED THE THERMOSTAT ALSO. PERFORMED COOLANT BLEED OUT AND TEST DRIVE". Ever since then, I've been paranoid about the temp. I still catch a whiff of coolant from time to time and I'm told it's because the stupid pinch hose clamps they tend to use. They get stiff in the cold Wisc winters and allow some seepage. It all sounds bogus to me. What are your thoughts? Is smoke being blown up my skirt?
 
#6 ·
Both of my Darts have the 2.0 engine and never go above half on the gauge. Are you considering replacing the temp sensor? The engine coolant temp sensor is mounted on the thermostat housing. A new thermostat comes with the sensor. How hot is the outside temp when you see 247 degrees? How are you measuring the temp? Is that what a scanner is showing? Any codes?
 
#5 ·
247 seems a bit excessive. My old 2.0 would sit at half until i got stuck in traffic in the summer in which it would creep up to the 3/4 mark, then the fans kicked on and it dropped.

I never measured that car though so I don't know what the actual temps were, but my fans kick in on the 2.4 at exactly 230 degrees...

247 id say the fan temp sensor is bad, but I think these cars are a bit smarter and actually read the data in numerical format. Old school (and it's not even that old) sensors you had the fan wired directly to the "dumb" sensor which was screwed into the thermostat or close thereafter.
Are you sure it's 247? Did you plug your own odb2 reader in and check it?
 
#7 ·
I'm curious. is the fan still wired directly to the sensor or is it some new fandangled mess heading to another module?
I guess I could walk out and check, but I'm mid movie atm.
 
#8 · (Edited)
The sensor sends the signal to the PCM. The PCM decides when to turn the fan on. The gauge gets input through the CANBUS from the PCM. Any extremes should set a code.
124635

124636
 
#10 ·
Mine never runs that hot anymore. Mine in summer, hottest it gets is maybe 210 220 and that's sitting in idle and down the highway drops to 198. Belly pan is gone, AGS is gone. I average 37 mpg on highway. I'm at 250 miles now on a tank and still over half tank in my 2.4 and i live in phoenix. Car runs better then it ever did from the factory. All these problems people are having I'm telling you is from the extreme heat under the hood heat destroys electrical parts, sensors, and our ignition coils which is common issue on these cars. I've went to a cooler burning plug better heat transfer to cooling system, running E3 spark plugs. And eliminated that dreadful syncromesh in my manual transmission and went to a Redline MTL 75w80 gear oil. Every change I do, the better the car runs.