2014 Silverado coolant temp

[Roger72]

I have a 2014 Silverado with about 75k miles on it. I just started noticing my engine temp fluctuating while driving between 200-210 degrees. I have had the truck for 4 years and haven’t noticed it moving nearly as much. Usually it is dead on 210 after warming up and stays steady. It is now moving slightly back and forth slowly. What could be causing this or is this even an issue? 

[14 Silvy]

Normal


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[m3n00b]

Thermostat could be stuck open. Not a big deal and no cause for alarm 

[btj_z71]

29 minutes ago, Roger72 said:

I have a 2014 Silverado with about 75k miles on it. I just started noticing my engine temp fluctuating while driving between 200-210 degrees. I have had the truck for 4 years and haven’t noticed it moving nearly as much. Usually it is dead on 210 after warming up and stays steady. It is now moving slightly back and forth slowly. What could be causing this or is this even an issue? 

Not an issue, I've experienced the same over the past several years.  Cooler outside temps and lower relative humidity allows it to run slightly cooler than in the summer.  

 

Try putting it in perspective - there are so many variables at play that it is unreasonable for to expect the temp to be the same.  Take into account outside temperature and relative hunidity, driving conditions (rain, snow, etc.), driving style, vehicle condition, fluid condition, etc,.  Just trying to drive home there is nothing to worry about. 

[silveradosid]

my 2014 was doing that also, put a new thermostat in and now it doesnt fluctuate

[CamGTP]

Agreed, I wouldn't worry about it right now. Not until it's not able to heat up at all.

 

My thermostat is sticking some on mine. Cruising down the freeway tonight with 35-40 degree temps I was only able to get 180ish on the coolant temp.

 

Time for some airflow blockage because I'm not doing the thermostat just yet LOL.

[Grumpy Bear]

You see that small rubber line running from the thermostat housing to the tank? That is a metered minimum flow by pass to keep the pump happy. That tank feeds the suction side of the system and as such keep the water moving. That little trickle of water is enough on a cold day to keep the thermostat closed. Until it can open enough to 'regulate' flow it will cycle. On a cold day, 30 or colder, mine will cycle until we've been on the road  under steady load for about 30 miles. First time load comes off, like fuel trims at or near zero down a long grade it will cycle again. That so I block off over half my grill opening in the winter.

 

[Roger72]

Ok if it gets worse, how would I know if it is the thermostat Sticking open or faulty temp sensor? 

[CamGTP]

Use a heat gun on the coolant hoses.

 

Gotta be somewhat quick about when you do check it because of heat soak for idling. So if you took a drive and the temps where between the 160 and 210 mark, the scan tool coolant temp said 180ish. Then you'd temp gun the coolant hoses and if they were really close to the scanner/cluster it won't be a temp sensor fault.