Toyota Yaris Thermostat Replacement – DIY o r Professional?

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Toyota Yaris Thermostat Replacement – DIY o r Professional?

Hi everyone,

I’m starting to think that my thermostat may be failing in my Toyota Yaris. The car seems to be running cold, and the heater is not as effective as it used to be. I’ve heard that replacing the thermostat isn’t too difficult, but I’m wondering if it’s something I should attempt myself o r leave to a professional.

For those who have replaced the thermostat in their Yaris, was it a relatively easy DIY job, o r did you run into issues? How long did the replacement take, and what tools did you need?

Would love to hear your experiences!

Sandeep asked on 28 Jan 2025 13:41:29 pm

1 Answer

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Car Mechanic Expert - on 28 Jan 2025 13:48:05 pm

If youre noticing that your Toyota Yaris is running cold and the heater isnt working as effectively, it could indeed be a sign of a failing thermostat. Replacing the thermostat in a Yaris is generally a manageable DIY task, especially if youre comfortable with basic car repairs. Youll typically need a socket set, a wrench, and a drain pan for coolant. The job can usually be done within a couple of hours, depending on your experience and the specific model year of your Yaris.

If youre planning to attempt the repair yourself, youll want to drain some of the coolant, remove the thermostat housing, replace the thermostat, and then refill the coolant. Its a good idea to ensure that the cooling system is properly bled afterward to avoid air pockets that could cause overheating.

However, some people might run into difficulties with stubborn bolts o r might not be familiar with how to properly handle the coolant system. In those cases, seeking professional help could be a good option, especially if youre unsure about the tools o r steps involved.

If youve replaced a thermostat before, it could be a straightforward job for you. If youre not experienced with car repairs, it might take a little longer and could require additional steps, but with patience, it’s doable.