Red
The colour helps indicate urgency, but exact behaviour can vary by manufacturer.
Dashboard Warning Light
Coolant Temperature
Engine overheating. The usual first step is: Stop safely, let engine cool.
Stop safely
Use this as a quick triage label before confirming in your owner manual.
Stop safely, let engine cool
Check the matching manual page for your exact brand, model and year when possible.
What it usually means
Engine overheating.
What to do next
Stop safely, let engine cool. If the vehicle feels unsafe, stop in a safe place and arrange professional inspection.