Hello,
That is what it sounds like to me. If you have replaced the thermostat, water pump, and fan clutch, I would recommend a radiator flush and fill. The only other thing that I could think of that might be a problem, would be that there is an air pocket in the system not allowing the coolant to circulate.
I have included a link for you down below.
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
Please go to the link and go through the guide, then please get back to us with what you find out.
Thanks,
Alex
2CarPros
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Thursday, March 14th, 2019 AT 12:52 PM