Overheating 2016 ST

[VegasJoe]

Hi - new member.
Owned a 2014 from 2014-19 and have been keeping my eyes open for a clean lower miles example.

Test drove a ‘16 with 77k miles, most of the regular bolt ons including full exhaust, cold air intake, Cobb intercooler and access port, and aftermarket 3 row radiator.

Very hot and dry here about 105 degrees. Started car and drove for about 10 minutes on back streets. Noticed AC was not cooling down much but that’s often the case for alot of cars here unless cruising at constant highway speeds.
A handful of quick pulls from 5-60 mph well short of redline.
The overheat symbol came on and the Cobb access port was reading oil temps at 240-250.
Suggested a short cruise on the highway. Temps dropped to 235 and overheat symbol turned off. AC started to cool the car a bit so it was functional but air never got cold.
Felt like the car lost alot of power thinking maybe went into limp mode?

Surprised because everything I read says an aftermarket radiator solves the overheating problem.
Also doesn’t having an aftermarket intercooler help keep engine temps down?

Thanks in advance for any insight!

 

[Stubborn Approach]

Likely air in the cooling system. There is a bleed cap on top of the radiator that makes bleeding the system easy.

Waiting for the temperature light to come on is 240+ degrees, which will put the car into limp mode until it cools down. Any AC will have trouble working under these circumstances.

 

[Grsemky]

Hi - new member.
Owned a 2014 from 2014-19 and have been keeping my eyes open for a clean lower miles example.

Test drove a ‘16 with 77k miles, most of the regular bolt ons including full exhaust, cold air intake, Cobb intercooler and access port, and aftermarket 3 row radiator.

Very hot and dry here about 105 degrees. Started car and drove for about 10 minutes on back streets. Noticed AC was not cooling down much but that’s often the case for alot of cars here unless cruising at constant highway speeds.
A handful of quick pulls from 5-60 mph well short of redline.
The overheat symbol came on and the Cobb access port was reading oil temps at 240-250.
Suggested a short cruise on the highway. Temps dropped to 235 and overheat symbol turned off. AC started to cool the car a bit so it was functional but air never got cold.
Felt like the car lost alot of power thinking maybe went into limp mode?

Surprised because everything I read says an aftermarket radiator solves the overheating problem.
Also doesn’t having an aftermarket intercooler help keep engine temps down?

Thanks in advance for any insight!

View attachment 70347 View attachment 70348

We don't have an actual oil temp sensor on our cars and that reading is only inferred... What was the actual coolant temp reading?

I'm in AZ and my car blows cold at idle, you might want to make sure the fan is working well!

 

[VegasJoe]

We don't have an actual oil temp sensor on our cars and that reading is only inferred... What was the actual coolant temp reading?

I'm in AZ and my car blows cold at idle, you might want to make sure the fan is working well!

It was the oil temp displayed on the face of the Cobb Accessport the owner had installed and left in place (I know they can be removed after uploading tunes).
the fan was working.

 

[Grsemky]

It was the oil temp displayed on the face of the Cobb Accessport the owner had installed and left in place (I know they can be removed after uploading tunes).
the fan was working.

Yeah Cobb uses coolant temp and a few other sensors to calculate a most likely oil temp, but there is no sensor located on our engines for oil temp. You can change the 6 gauges displayed on the AP at any time so can monitor whatever is clever.... Fans turning on and fans spinning at the appropriate speed is not the same, you shouldn't have any problem getting cold AC at idle... It may take a minute or two to cool but nothing crazy.