started overheating on my way to work?

2017 LINCOLN MKZ

49,400 MILES • 2.3L • 4 CYL • 4WD • AUTOMATIC

AUSTIN BAKER

MEMBER
1 POST
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So, I added coolant and let it set for 8 hours while at work. When I started it again after work it still said overheating and is in the red. There was no gradual build up to overheating it just went straight to red and will not come back down.

Mar 14, 2023 at 3:47 PM

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JACOBANDNICKOLAS

AUTOMOTIVE REPAIR CONTRIBUTOR
110,190 POSTS

Hi,

It sounds like the cylinder head temperature sensor (CHT) has shorted or failed internally. If it is jumping straight to overheating, we know that can't be accurate.

I attached directions below for replacing the CHT. You can try to simply replace it and check the wiring and connectors along the way, or you can scan the can-bus to see if there is a short causing the issue.

Here is a link that explains how to scan the can-bus:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know your thoughts or if you have other questions.

Take care,

Joe

See pics below.

Images (Click to enlarge)

Mar 14, 2023 at 9:40 PM