Hi and thanks for using 2CarPros.
If you didn't flush the engine block, my first suspect is that there was still Toyota Long Life Coolant in the engine. It is pink. Take a look at the picture I attached. I was able to find it online so you can see the color. Now keep in mind, it will have mixed with what you added, so the color may not be exactly the same.
As long as you used the proper type of coolant, there shouldn't be any problems.
Take a look and let me know if you have other questions.
Joe
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Wednesday, March 6th, 2019 AT 12:54 PM