Coolant temps

[Ryan J]

Something about my coolant temps have been catching my attention this winter. I know its colder out but just doesnt seem to be getting as warm as it should. The truck idled for 20 minutes, i drove 20 minutes roughly getting up to 60mph and im idling again and my digital temp says 176, gauge temp is barely above the first line. Like a 1/4 of the gauge and its 50 degrees out. What do yal think or what are yal seeing?

 

[Burla]

Thermo stat might be stuck open, better to be stuck open then closed.

Should always include truck and miles etc.

Is there any other issue such as cool heater?

If you are gonna replace it go OEM for quality.

 

[caulk04]

Why did it idle for 20min? 5min tops before driving, then just drive gently a couple miles.

Anywho, did it slowly climb to that temp or did it rise quickly and settle there?

My truck sat outside last night, 30º. Hit the remote start, tied shoes, sweatshirt on, walked out and set off. The HVAC system will kick up at ~120º coolant temp and it always does that about 1-1.5mi down the street at ~35mph.

 

[Ryan J]

Thermo stat might be stuck open, better to be stuck open then closed.

Should always include truck and miles etc.

Is there any other issue such as cool heater?

If you are gonna replace it go OEM for quality.

2012 1500 5.7L laramie limited
Miles are in picture. 195k
Heater was blowing 140 degree air out.

 

[Ryan J]

Why did it idle for 20min? 5min tops before driving, then just drive gently a couple miles.

Anywho, did it slowly climb to that temp or did it rise quickly and settle there?

My truck sat outside last night, 30º. Hit the remote start, tied shoes, sweatshirt on, walked out and set off. The HVAC system will kick up at ~120º coolant temp and it always does that about 1-1.5mi down the street at ~35mph.

Welll because im taking the last 2 weeks of the year off from work. I was swapping some stuff over from my work truck to my personal truck like some personal things, a pew pew, some tools, a work coat so it can be washed. Its also been setting since monday morning so i like to start it and give it a little time before i stomp on the gas. Yes i know it doesnt need 20 minutes, thats just the information i was giving out so you all have an idea of how long the truck was running. I also know that idling supposedly eats the lifters and cam ‍

 

[Burla]

As far as idle, how long did it take to kick down the idle if at all? It isn't idle that kills these, it is rpm, as long as rpm's are bumped up less of an issue.

With the fact you are on HOAT coolant in 2012, you should be on 3rd coolant flush at a minimum but the fact it is near impossible to 100% flush perhaps you should be on flush number 5 at this point. I would stick with Mopar hoat or move to GO5 and run rmi-25 with every flush. Sometimes something small like a stuck thermo is the canary in the cool mine and developing a strategy can prolong engine life. I would also inspect the radiator hoses from the inside for any signs of gunk.

Probably needs a thermostat anyhow, but also aging vehicles with 5 year coolants should bump up maintenance. RMI 25 is a leave in product. never use dex coolant, ever.







.

 

[caulk04]

Welll because im taking the last 2 weeks of the year off from work. I was swapping some stuff over from my work truck to my personal truck like some personal things, a pew pew, some tools, a work coat so it can be washed. Its also been setting since monday morning so i like to start it and give it a little time before i stomp on the gas. Yes i know it doesnt need 20 minutes, thats just the information i was giving out so you all have an idea of how long the truck was running. I also know that idling supposedly eats the lifters and cam ‍

No worries, just asking.

Mostly I was curious if it's a slow climb (stuck open thermostat) or if you were just noticing the operating temp and it has a lower temp stat.

 

[62Blazer]

What would you expect the temps to be in this situation? Do you have the factory thermostat, which I would expect to be around 200 F when fully warmed up. 50F is not very cold outside by any means.
Is the temp fluctuating, meaning when you are driving it goes up a decent amount? I'm talking a couple degrees, I mean are seeing up around 200 driving and when you stop and idle it drops down to 176.
In any case 176 is not an extreme low number, but it is lower than I would expect on a fully warmed up engine.

 

[Ryan J]

What would you expect the temps to be in this situation? Do you have the factory thermostat, which I would expect to be around 200 F when fully warmed up. 50F is not very cold outside by any means.
Is the temp fluctuating, meaning when you are driving it goes up a decent amount? I'm talking a couple degrees, I mean are seeing up around 200 driving and when you stop and idle it drops down to 176.
In any case 176 is not an extreme low number, but it is lower than I would expect on a fully warmed up engine.

Not sure abourt the tstat, ive had the truck 7 yrs and its never been changed. I would assume its original. Pretty sure its stuck open. The other morning it was 15 degrees and i dont think it ever got over 160ish and didnt do that til i got up on the highway doing 80. Ive never got a code for not getting up to temp yet. Idk what the temp is that it has to get to, to clear that. I plan on getting a new stat for now.

 

[Ryan J]

No worries, just asking.

Mostly I was curious if it's a slow climb (stuck open thermostat) or if you were just noticing the operating temp and it has a lower temp stat.

During the summer i barely see it get over 200. Im pretty sure its the original stat. Ive had the truck 7yrs and i havent replaced it. Yes its a slow climb, doesnt get higher in temp until i start driving getting some rpm's through it.

 

[Wild one]

During the summer i barely see it get over 200. Im pretty sure its the original stat. Ive had the truck 7yrs and i havent replaced it. Yes its a slow climb, doesnt get higher in temp until i start driving getting some rpm's through it.

If it's never really got above 200,i wouldn't be surprised if at some point in time,somebody swapped a 190 thermostat into it,the stock t-stat is 203.If you look inside the barrel of the thermostat,it should have it's operating temp stamped into it,it'll be in small numbers,but most t-stats are stamped. Before you install any new thermostat these days,chuck it in a pot of water on the stove,and use a meat thermometer to check the temp of the water the thermostat starts to open at.
FYI just cause it's new and works when you initially install it,that doesn't mean it'll last past 6 months,the days of thermostats lasting 10 years are long gone

 

[Ryan J]

Welp CEL came on today, temp was about 156. Havent checked the code but assuming its the low temp code

 

[Ryan J]

Got code p1239. Im seeing a couple different things just googling it, seeing low oil temp, faulty fuel pump.

 

[Ryan J]

Does anybody happen to have a code list? 2012 ram 1500 5.7 4x4 laramie limited.
P1239
Ive seen speed fuel pump positive feed fault and low oil temp

 

[Bigskyroadglide]

P1239 DODGE - Engine Oil Temperature Too Low
- Faulty Engine Oil Temperature Sensor
- Engine Oil Temperature Sensor harness is open or shorted
- Engine Oil Temperature Sensor circuit poor electrical connection

 

[Hemi395]

Does anybody happen to have a code list? 2012 ram 1500 5.7 4x4 laramie limited.
P1239
Ive seen speed fuel pump positive feed fault and low oil temp

From service data:
The Engine Oil Temperature (EOT) Sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5-Volt reference and a ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low.

• When Monitored:
  The engine oil temperature has dropped below a calibrated temperature value. Engine start up.
• Set Condition:
  The Engine Oil temperature rises slower than a calibrated modeled temperature. When the actual oil temperature falls below the low boundary of the calibrated modeled temperature for three minutes the fault is set. Two trip fault. Three good trips to turn off the MIL.

Possible Causes​ ​
ENGINE OIL
(G24) EOT SIGNAL CIRCUIT HIGH RESISTANCE​
(K915) SENSOR GROUND CIRCUIT HIGH RESISTANCE​
ENGINE OIL TEMPERATURE SENSOR​
POWERTRAIN CONTROL MODULE (PCM)​

 

[Wild one]

Does anybody happen to have a code list? 2012 ram 1500 5.7 4x4 laramie limited.
P1239
Ive seen speed fuel pump positive feed fault and low oil temp

Fix your thermostat issue first,if that doesn't cure the issue,then dig deeper

 

[Ken226]

Fix your thermostat issue first,if that doesn't cure the issue,then dig deeper

Exactly.

The engine is being overcooled due to a stuck open thermostat, now there is a code indicating that the engine oil temp is too low. The oil flows through the same engine block that is being overcooled.

There might be a cause/effect relationship here.

 

[Ryan J]

Yeah fixing the thermostat first is my plan, i was just making sure the code wasnt something else.

 

[Ryan J]

Exactly.

The engine is being overcooled due to a stuck open thermostat, now there is a code indicating that the engine oil temp is too low. The oil flows through the same engine block that is being overcooled.

There might be a cause/effect relationship here.

Yeah i get that. I just wanted to make thats what the code is.