Are these cylinder head temps high?

[ay1820]

I have been noticing what seem like high cylinder head temps. I am not getting any kind of code or warning and everything is running fine, but they seem a bit higher than what others have described for CHTs.

Cruising on the highway at about 75mph, I am seeing CHTs of 210-212 degrees with inlet air temps of around 100. Just driving around without any aggressive pulls I will typically see temps of around 205-210, but I live in a hilly area and when I start up hill, the temps will quickly jump to 220+ on inlet air temps of about 95.

Are these typical?

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[SheepDog]

220+ does seem a bit high. I can do a WOT pull to redline up a hill, and it rarely exceeds 205.

Cooling fans coming On?
Have you done any work on it that required opening the cooling system?
Plastic bag or trash blocking the grill?

 

[ay1820]

220+ does seem a bit high. I can do a WOT pull to redline up a hill, and it rarely exceeds 205.

Cooling fans coming On?
Have you done any work on it that required opening the cooling system?
Plastic bag or trash blocking the grill?

Cooling system has never been worked on (to my knowledge, I bought the car used with 980 miles on it and the service history did not mention any cooling system service). I'll check the fans tomorrow. Any idea about when (what temp) they should kick on?

 

[SheepDog]

Cooling system has never been worked on (to my knowledge, I bought the car used with 980 miles on it and the service history did not mention any cooling system service). I'll check the fans tomorrow. Any idea about when (what temp) they should kick on?

I believe the OEM thermostat is 180 degrees, but the setpoint of the fan is unknown to me (Im sure someone with FOrescan couldtell us)

You can verify fan operation by switching on the A/C, but that will not tell you if the PCM is triggering the cooling fan from the coolant temp sensor, but rather just to verify that the fans do indeed work.

How many miles on your car now? Did this just start happening or has it always hit 220+ with load?

 

[Wickedluis]

I have been noticing what seem like high cylinder head temps. I am not getting any kind of code or warning and everything is running fine, but they seem a bit higher than what others have described for CHTs.

Cruising on the highway at about 75mph, I am seeing CHTs of 210-212 degrees with inlet air temps of around 100. Just driving around without any aggressive pulls I will typically see temps of around 205-210, but I live in a hilly area and when I start up hill, the temps will quickly jump to 220+ on inlet air temps of about 95.

Are these typical?

I live in Austin Texas and my CHTs vary from 195 to 230 , but it usually averages about 210. Temps here have been at over 100 Degrees during the day the last month . My intake temps also vary depending on if I am driving or in heavy traffic, driving around in 100 degree temps I see 110 on average , if I am in heavy traffic my intake temps have climbed to 175 . I do have a stage 2 whipple with intercooler and my MCTs stay a lot cooler .

 

[carguy231]

My CHT, with the PP cooling gets to 210 with the SC, cruising. I've never seen 220 or 230.

 

[luca1290]

It's ok, you are driving in a very hot climate, the temp is a little high but not that high to cause troubles.
Glycol water mixture will boil at 264F, but the car will degrade performance much before that temp. I will not worry.

 

[black22gt]

I have been noticing what seem like high cylinder head temps. I am not getting any kind of code or warning and everything is running fine, but they seem a bit higher than what others have described for CHTs.

Cruising on the highway at about 75mph, I am seeing CHTs of 210-212 degrees with inlet air temps of around 100. Just driving around without any aggressive pulls I will typically see temps of around 205-210, but I live in a hilly area and when I start up hill, the temps will quickly jump to 220+ on inlet air temps of about 95.

Are these typical?

I'm gonna try to see what mine is doing on my way home. I think these are a bit high if you have clean air in front of you, but if there's traffic moving with you pretty close it might be a bit more reasonable. I know we've been having a bunch of over 100+ days here, and my car has been going 205 or maybe more, just not sure if that was highway or 40 mph back roads, and how aggressive I was on the throttle for that memory.

If it's under 90 outside, though I'm pretty sure my car stays pretty rock solid at 190 if i take it easy on the highway with clean air in front of me, some hills but not like mountains or anything. If your ambient temps are more like that where you live then i would probably look into it a bit more.

My memory is garbage though, so I'll try to pay attention on my ride home and get you an update with ambient, IAT and CHT while I'm cruising. I think my car is pretty solid in the temp department usually, so perhaps a comparison will help. I'm a stock manual base GT with Active Exhaust no PP, just for comparison purposes in case you are PP, as it has a bigger radiator and what not.

 

[ay1820]

I believe the OEM thermostat is 180 degrees, but the setpoint of the fan is unknown to me (Im sure someone with FOrescan couldtell us)

You can verify fan operation by switching on the A/C, but that will not tell you if the PCM is triggering the cooling fan from the coolant temp sensor, but rather just to verify that the fans do indeed work.

How many miles on your car now? Did this just start happening or has it always hit 220+ with load?

The car has about 4,200 miles on it. I bought it about a year ago, but really didn't notice this until a few months ago (but to be fair, I did not specifically look at CHTs before). I will check the fans tomorrow.

 

[black22gt]

So to update, it was 192-196 CHT @ 103 ambient, 111ish IAT while driving 60 on cruise control in 6th for 20 ish minutes constantly, plenty of clean air in front of me. Closer to my house is some 35-45 mph back roads at 102-99 ambient in 4th or 5th, CHT 194-198 IATs round 112-109. Got a couple degrees cooler closer to home. I'd say unless you have super high humidity or way higher ambient temps than that, then that is quite a bit higher than what I get when I drive more conservatively. It is not humid at all and I use my AC always.

 

[ay1820]

Thanks for all of the feedback!

 

[tdstuart]

I've recently dealt with 2 big cooling problems...
It is an absolute pain trying to dial in your cooling system, so many factors play into it.

Feel free to read through 17 pages of pain:
https://www.mustang6g.com/forums/threads/overheating…-again.190276/

It took a lot of diagnosing and thinking and testing for me to be about 50% confident my issue was with my radiator. Luckily it was and it fixed my issues.



The problem is your issue isn't bad enough. It's hard to clearly tell what the issue is or if there is an issue.

Are you able to do long pulls like 130mph+? I know you mentioned hills but I have no experience with my cars cooling on hills so hard to use as a reference.

Also, it may be worth it to discuss if this issue is even worth looking into. Do you race the car? Have you seen the temps above 230? If this is just a daily driver and you don't do long pulls or races then having the temps get to 220 isn't concerning.

 

[ay1820]

Too rainy and wet for a long ride today, but after about 10 minute drive with CHTs of around 190, the fan was NOT running, so that may be my problem. The coolant temp gauge was right in the middle, like it always seems to be (I wish we had a readout option for coolant temp in addition to CHT). Will need to schedule a service call to have this checked.

Thanks again for the responses!

 

[1emglenn]

Too rainy and wet for a long ride today, but after about 10 minute drive with CHTs of around 190, the fan was NOT running, so that may be my problem. The coolant temp gauge was right in the middle, like it always seems to be (I wish we had a readout option for coolant temp in addition to CHT). Will need to schedule a service call to have this checked.

Thanks again for the responses!

According to my mechanic the cooling fan doesn't even come on until CHT 230.

 

[black22gt]

Too rainy and wet for a long ride today, but after about 10 minute drive with CHTs of around 190, the fan was NOT running, so that may be my problem. The coolant temp gauge was right in the middle, like it always seems to be (I wish we had a readout option for coolant temp in addition to CHT). Will need to schedule a service call to have this checked.

Thanks again for the responses!

Does the fan come on if you turn on your A/C?

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