• Sign Up! To view all forums and unlock additional cool features

    Welcome to the #1 Explorer ST Forum and Explorer ST community dedicated to Explorer ST owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the Explorer ST Forum today!


Running too cool. Stuck tstat?

Messages
86
Reactions
36
Points
17
Location
Massachusetts
Vehicle
2023 ST
#1
Bone stock '23 ST w 26K miles

I was alerted to this when I was programming something via ForScan, but it showed a pending DTC for a P0128. Accidentally erased it unfortunately. But decided to monitor coolant temps for a bit and noticed i run consistently 172-177 degrees. Only once did I ever see 205 degrees. But 99% of the time i'm at 175 degrees on a 95 degree humid day sitting in traffic. On cool mornings and evenings, I run about 172-174. From browsing threads, i see i should be running around the standard 200 degrees that modern EFI engine normally run at. Coolant level is good.

I keep checking my DTC's and the pending P0128 hasn't returned.

Swapping out a tstat is not a huge issue for me. I've done more involved stuff. My concern is that i'm at 26K miles and have an ESP. I'd rather a dealer take care of it for the paper trail, so that if there is an issue down the road, i don't have to argue about it. (i've had issues with past cars)

But does this align? Should I be running warmer? Is a tstat replacement the logical next step? Would you just DIY it..or should I wait and see it a DTC comes back since I have time.

BTW these P3 V3 gauges are nice for this sort of stuff.
IMG_6934.jpeg
 

Last edited:

UNBROKEN

5000 Post Club
Messages
5,154
Reactions
6,177
Points
352
Location
Houston, TX, USA
#2
I put it a 170° t-stat to keep mine in that range. It’s fine.
 

Messages
2,326
Reactions
1,061
Points
252
Location
Nevada
Vehicle
'20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
#3
It’s fine for the car to be running there, it’s abnormal for stock T stat but I wouldn’t worry about it.
 



Top