Overheats at idle

Tiny
JOANNA CURTIS
  • MEMBER
  • 2018 JEEP CHEROKEE
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 110,163 MILES
Vehicle overheats only when idling. Replaced water pump, coolant hose, thermostat, radiator, and radiator fan. What else could it be?
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Thursday, October 14th, 2021 AT 3:22 PM

3 Replies

Tiny
SQM
  • EXPERT
Hello,

Typically, when the overheating happens at idle or when the vehicle is not moving, it is due to an inoperative fan.
So, does the cooling fan come on when the car reaches operating temperature?

You stated that you have replaced it, just want to make sure we are on the same page.
Keep in mind that the fan may not come on if the coolant temperature sensor is faulty.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

Please let me know what you are experiencing.
Thank you.
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Thursday, October 14th, 2021 AT 6:46 PM
Tiny
JOANNA CURTIS
  • MEMBER
Yes, fan comes on and you can hear it as it kicks in higher.
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Thursday, October 14th, 2021 AT 6:51 PM
Tiny
SQM
  • EXPERT
I wonder if the grille shutter might not be opening as designed.
This Jeep is equipped with active grille shutters, it is located at the bottom of the grille (see diagram below). The purpose is to keep that area closed to improve fuel efficiency, but open when the engine needs cooling to improve air flow through the radiator.
It is possible that the shutter is stuck closed, due to the actuator being faulty.
So even if the radiator ran turns on in high it is just not getting enough air through.
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Saturday, October 16th, 2021 AT 2:41 PM

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