rainer_ice3
LandCruiser Diesel Overheating
Summary of the thread
A 2021 Toyota LandCruiser diesel with 79,198 km is experiencing overheating issues and takes longer than usual to reach operating temperature. The suspected cause is a faulty thermostat cooling circuit motor. After ruling out coolant leaks, it was confirmed that the map thermostat was defective, and repairing it resolved the issue.
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4 comment(s)
rainer_ice3 (community.author)
Coolant levels are normal, and there are no signs of leaks. You mentioned the thermostat in your Audi. Was it a simple fix or something more involved?
theowolf18
In my case, it was indeed the thermostat, or more precisely, the map thermostat. If you've ruled out coolant leaks, a defective thermostat is likely the culprit. I suggest getting it checked out by a workshop.
rainer_ice3 (community.author)
Thanks. Confirmed it was the map thermostat. Repair ran about 350€. All good now.
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TOYOTA
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LANDCRUISER
theowolf18
Sounds familiar. I had similar overheating issues with my 2018 Audi Q7. It was also slow to warm up. Was the thermostat the culprit? Have you checked the coolant level first?