Hi,
If it is white smoke, there is a good chance it is coolant leaking onto the exhaust or a hot spot on the engine. Where is the heater core leaking? Is it into the vehicle or is it where the hoses attach under the hood of the vehicle? Also, if you open the hood, can you tell an approximate area where the steam is coming from? For example, front of the engine, behind the engine, near the radiator and so on.
If possible, record what is happening and upload it for me to see. Also, here is a link that explains how to locate and fix a coolant leak. I'm adding it in case you feel it could be a new leak.
https://www.2carpros.com/articles/car-is-leaking-coolant
Let me know.
Joe
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Friday, April 2nd, 2021 AT 11:06 AM