Hi,
Okay, the idea that it happens when driving in town indicates it requires more airflow than the fan can provide.
So, two things. First, the coolant reservoir cap is vented. But it needs to hold a specific amount of pressure. If it isn't holding enough, the coolant's boiling level drops and can overheat easier.
Next, if the cooling system wasn't properly bled, absolutely that can cause what is happening. Don't laugh, but when it starts getting hot, does the heater work?
Let me know.
Joe
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Thursday, September 15th, 2022 AT 6:25 PM