Failing Thermostat?

[Bobtipton]

For the past few days, I’ve noticed that my coolant temps are running about 10 degrees cooler than what they normally run (usually 202-203 - now running around 190-192 @65 mph no load).

Also used to see the max temp on the RaceME Ultra for the coolant at 208-210, then the thermostat would open up and it would drop to 202.

Today, it got to 199, then dropped to 189, then stayed around 192.

I do have a small leak (but only when cold) around the O-ring on the EGR cooler delete (where the “burp” screw is). But I can’t see how that would cause the temp differences.

So, is the thermostat failing partially open?

I don’t think it’s full open as truck warms up as quickly as before.

Thanks in advance!

Bob


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[AK Bob]

For the past few days, I’ve noticed that my coolant temps are running about 10 degrees cooler than what they normally run (usually 202-203 - now running around 190-192 @65 mph no load).

Also used to see the max temp on the RaceME Ultra for the coolant at 208-210, then the thermostat would open up and it would drop to 202.

Today, it got to 199, then dropped to 189, then stayed around 192.

I do have a small leak (but only when cold) around the O-ring on the EGR cooler delete (where the “burp” screw is). But I can’t see how that would cause the temp differences.

So, is the thermostat failing partially open?

I don’t think it’s full open as truck warms up as quickly as before.

Thanks in advance!

Bob


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If you have the OEM thermostat should be 190F. Your latest temperature readings look normal to me. I would just keep an eye on it to see if it changes.


2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

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[Bobtipton]

If you have the OEM thermostat should be 190F. Your latest temperature readings look normal to me. I would just keep an eye on it to see if it changes.


2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

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Yes, OEM original. When truck was new, it ran around 197. I’ll keep watch on it. As long as it doesn’t stick closed, I’m good...

Thanks for the response!

Bob


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[DDP]

What Mr. Bob Said

Hit the nail on the head.

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[cwendel]

Is it cold where you are? Low temps will lead to lower engine temperatures. My trans barely got out of the teens this morning.

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[Bobtipton]

Is it cold where you are? Low temps will lead to lower engine temperatures. My trans barely got out of the teens this morning.

2013 2500 6.7 cummins crew cab. white and stock as can be
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Nope - not cold. We’re in Southern California.


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[cwendel]

Then make sure you are topped off.
Since you are in Cali, you might have had air in the system that just cleared and never noticed the poor heater performance that goes with it.

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[Bobtipton]

Well, just as I suspected.

Bad thermostat.

Truck set this code today. Will not reach 190 degrees at 75 mph and 74 degrees ambient air temp.



Don’t know the other code is...

Bob


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[AK Bob]

Well, just as I suspected. Bad thermostat. Truck set this code today. Will not reach 190 degrees at 75 mph and 74 degrees ambient air temp.

https://uploads.tapatalk-cdn.com/202...b6FCA252ff.jpg

Don’t know the other code is...

Bob


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The P2299 code can be caused by double footing the brake and accelerator pedals at the same time. I would clear the code and see if it returns.


2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

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[Bobtipton]

The P2299 code can be caused by double footing the brake and accelerator pedals at the same time. I would clear the code and see if it returns.


2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

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Yeah, I do that sometimes when I’m trying to get turned leftout of a side street across a 4-lane road.

Will the faulty stat cause me any issues until I can get it replaced? Getting ready to haul the fiver from Yuma to Albuquerque.

Thanks,

Bob



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