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Discussion Starter · #1 ·
Hi everyone,
I’m curious if anyone is experiencing the same fluctuations in coolant temps as me. I’m also interested in any opinions on what the max safe coolant temperature should be.
I have a 2016 ecoboost with 134k miles. I installed an ultra gauge to get a better idea of what’s happening. I track my coolant temperature and during normal stop and go driving it usually fluctuates between 190 and 210. I got concerned the other day because I was stopped and I slowly watched it climb to 226. It was idling normal and only 70 degrees out. Once I started driving again it went back to the range I was used to. Should I be concerned?
Thank you in advance for any help
 

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2022 T150 Cargo AWD SWB LR (Service Van w/ Adrian Steel Upfit)
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My experience with other vehicles where I can see the actual temperature tells me those are normal values.
 

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Hi everyone,
I’m curious if anyone is experiencing the same fluctuations in coolant temps as me. I’m also interested in any opinions on what the max safe coolant temperature should be.
I have a 2016 ecoboost with 134k miles. I installed an ultra gauge to get a better idea of what’s happening. I track my coolant temperature and during normal stop and go driving it usually fluctuates between 190 and 210. I got concerned the other day because I was stopped and I slowly watched it climb to 226. It was idling normal and only 70 degrees out. Once I started driving again it went back to the range I was used to. Should I be concerned?
Thank you in advance for any help
I've watched mine fluctuate from 185 to 226F. The high end is usually climbing hills at freeway speeds but I did have high temps climbing a road to Martis Valley LO earlier this summer. I'm concerned about prolonged heat saturation of the exhaust manifold that I attribute to the exhaust bolt failure, that has been reported by many Eco rigs. I usually down shift into 5th and shutoff the AC if I'm pulling hills in the summer.
I would also verify if your electric fans are operating correctly. This video may help verify fuses and relays.
 

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After a trip to L.A. in 106 degree temp my coolant temp got up to 235. I immediately turned off the a/c. When I had my oil change I questioned the service manager at the dealership I go to. He said that eco boost engines run hotter than normal and to expect the variations based on speed and load.
 

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Discussion Starter · #5 ·
Thanks for all of the feedback. I can understand the temp going up under a load but I’m not sure what would make it go so high just idling. I believe my fan works because I haven’t over heated. Is there a secondary fan that kicks on sometimes as well? Could old coolant be an issue? I don’t know if it was ever changed by the previous owner. It’s the orange and I would think if they changed it that they would have went to the yellow.
 

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Thanks for all of the feedback. I can understand the temp going up under a load but I’m not sure what would make it go so high just idling. I believe my fan works because I haven’t over heated. Is there a secondary fan that kicks on sometimes as well? Could old coolant be an issue? I don’t know if it was ever changed by the previous owner. It’s the orange and I would think if they changed it that they would have went to the yellow.
lack of air flow and low rpm? I am not a mechanic but I have noticed temps rising when sitting in freeway traffic stopped.
 
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