Yes. This line is the heater return hose. So if that was clogged, I suspect the vent line was clogged as well. If those are clogged then the system will over heat because the system will get what is called a vapor lock in it and will not be very efficient. Once this happens the coolant will actually boil and the engine will over heat. I attached the detail below on these lines.
Also, here are some guides on how to flush the system as we need to make sure we get that rust out of the system:
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
Let's run through this and we can go from there. Thanks
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Wednesday, December 16th, 2020 AT 1:48 PM