Engine and coolant temp don't read below 100degF?

PoMansRam · Dec 10, 2018

I couldn't find other posts in regards to this. I was curious if this is a thing for all later model Rams. Per the dash readout on my 2017 Ram express 1500, pentastar QC 4x4, the transmission fluid temperature will read close to the ambient temp on cold starts, but the engine coolant and oil temps won't show below 100F? I wonder what the reasoning is behind that? If it's 20F out on a cold start, my transmission fluid temp will show maybe ~30F. Everything else will be 100F.

indept · Dec 10, 2018

It doesn't matter. Anything below 100f is cold as far as the engine goes. Now the trans is different. It will limit shifts based on tighter tolerances.

turkeybird56 · Dec 10, 2018

Not an issue, just how programmed as U know yer engine and oil gonna get over 100 deg, just saying, IMHO...

DaKing · Dec 10, 2018

also depends on the dash. The higher end dash does show lower temperatures.

huntergreen · Dec 10, 2018

Agree with above, cold reading doesn't matter, I want to know how hot it gets.

PoMansRam · Dec 10, 2018

I understand it's not an issue, it's just odd because I'm pretty sure a scanner would indicate the 'real' temperatures regardless of the 100degF dash default readout.

I would imagine the real coolant and oil temps are used to calculate the engine oil life. Not sure 100F would be considered a cold start. A cold start on a 90F day is a LOT different than one a -10F day.

huntergreen · Dec 10, 2018

PoMansRam said:
I understand it's not an issue, it's just odd because I'm pretty sure a scanner would indicate the 'real' temperatures regardless of the 100degF dash default readout.

I would imagine the real coolant and oil temps are used to calculate the engine oil life. Not sure 100F would be considered a cold start. A cold start on a 90F day is a LOT different than one a -10F day.

I think any start is considered a cold start until everything reaches operating temps. I suspect operating temps take longer to reach in Sub-Zero temps. The AMT of time it takes could be used as part of the calculation to determine oil life.

cbsmith · Dec 11, 2018

I have a 2014 with the 7” EVIC and it shows me the actual temperatures. I can see the oil and coolant being close to the outside air temperature when I start the truck. It will even show me the negative numbers.

Big Terry · Dec 11, 2018

My temp needle doesnt move til it hits 150. EVIC shows actual, but gauge is 150 minimum.

ronheater70 · Dec 11, 2018

DOnt know if its like my CTD or not, but my truck (and CTD In general) do not have an oil temp sensor .. Everything works off an algorythm through the PCM or something like that I read about it over on the cummins forum.

Jimmy07 · Dec 11, 2018

ronheater70 said:
DOnt know if its like my CTD or not, but my truck (and CTD In general) do not have an oil temp sensor .. Everything works off an algorythm through the PCM or something like that I read about it over on the cummins forum.

This is true for the CTD. All the gassers have actual oil temp sensors, though.

6.7CumminsDrvr · Dec 11, 2018

Mine shows below 100*

Engine and coolant temp don't read below 100degF?

PoMansRam

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indept

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turkeybird56

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DaKing

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