Coolant Temp Increase

[Abb0nz]

Hey Team,

My CHT is normally around the 205 mark with the coolant at about 10 degrees lower (using Torque). I happen to notice a couple of days ago that the CHT is going as high as 226 with the coolant at 210. It only happens at low speed and idle. At normal cruising speed it settles back down to normal. Coolant and oil levels are fine and the radiator isn't blocked that I can see.
Anyone have a idea what the problem could be? Is it a problem? The temp gauge doesn't move at all and I've got no codes.
2017 GT

Cheers
Paul

Sponsored

 

[Cobra Jet]

Hey Team,

My CHT is normally around the 205 mark with the coolant at about 10 degrees lower (using Torque). I happen to notice a couple of days ago that the CHT is going as high as 226 with the coolant at 210. It only happens at low speed and idle. At normal cruising speed it settles back down to normal. Coolant and oil levels are fine and the radiator isn't blocked that I can see.
Anyone have a idea what the problem could be? Is it a problem? The temp gauge doesn't move at all and I've got no codes.
2017 GT

Cheers
Paul

Paul,

There was a notification for the CHT, but I pertained to the 2019’s - however that’s not to say the CHT Sensor on a 2017 could be failing (even if there are no codes).

Check this link:
https://www.mustang6g.com/forums/th...mil-dtc’s-p1289-or-p017d.120216/#post-2513867

 

[ugstang17]

Not uncommon to see cylinder head temps rise at idle or in traffic as compared to open up top speed driving. BTW don't mistake CHT for ECT temps. Often times people confuse the two. CHT can be observed through an OBDII gauge or programmer device that has gauge monitoring ability.

Some checks for peace of mind would be to observe if the fan is coming on when the temps rise. Note if the fan goes into a higher speed if the temp continues rising. Observe at the higher level that the temps begin to drop (while not moving). If they do then chances are the unit is fine.

One thing that can mistakenly happen is adding coolant at 100% rather than the proper 50/50 premix if the wrong bottle was obtained.

Another situation that can happen even to the best (this is very hard to determine without a coolant tester), water evaporates much quicker than coolant. If you keep adding the 50/50 mixture the coolant level will increase and heat removal properties of the mixture will drop. I have seen this happen not only on cars, but other types of equipment I work on that require hear removal through a similar process.

Sponsored