vivienheld5
Sequoia Overheating
Summary of the thread
A 2015 Toyota Sequoia is experiencing overheating issues and delayed reaching of operating temperature, suspected to be caused by a malfunctioning map-controlled thermostat. The problem was confirmed by a diagnostic code P0128, indicating a potential issue with the engine coolant temperature (ECT) sensor or thermostat. The solution involved confirming a defective thermostat cooling circuit motor, leading to a repair quote of 350€.
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4 comment(s)
vivienheld5 (community.author)
Didn't notice leakage. But the fan... hmmm. When you had the issue, was the thermostat stuck open? My OBD reader is throwing a P0128 code, and I'm starting to think the ECT sensor is the culprit.
luisebaumann7
Yeah, my thermostat was indeed stuck open. I tried bleeding the system, but it did not work. I didn't want to risk further damage, so I took it to a workshop. That's what I would suggest.
vivienheld5 (community.author)
Appreciate the insight! Confirmed with the shop – defective thermostat cooling circuit motor, just like we thought. Quoted 350€ for the repair. Thanks for steering me in the right direction!
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TOYOTA
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SEQUOIA
luisebaumann7
I had similar overheating issues on my Sequoia. Check your thermostat housing for any signs of leakage or corrosion. Was the cooling fan running constantly, or not at all?