It sounds like it's coming out of the expansion tank. Does this only happen when you are at idle? Also, does the temp gauge indicate it is overheating, or does it stay in the middle when it happens? When it happens, are the cooling fans running under the hood?
I'm asking these questions because it can be caused by a few things. First, if the cooling fans are not turning on, it will likely overheat when the vehicle isn't moving. So that would be likely related to a bad fan motor or an electrical issue. If the temperature gauge is indicating a hot engine and the fans are running, then suspect a thermostat. If, however, the fans are running and the engine temperature is not past normal, it could be related to a bad head gasket.
Also, I'm going to provide a link that explains how to check for a bad head gasket. I want you to look through it. There are a few things you can identify just by opening the hood and checking things. Do this and let me know.
Let me know the answers to my aforementioned questions. That will better help me identify potential issues.
Thursday, December 10th, 2020 AT 6:49 PM