Hi Joel,
I'm not sure what type of system they are using to drain and refill the system. I never saw one that was refilled with pressure. I have seen them vacuum the coolant out, but when it gets refilled, the vacuum in the system draws most of the new coolant into the system.
Where are you noticing coolant that is a milky color? Is it on the dipstick? Also, is the vehicle running poorly now and experiencing a loss of power?
Let me know.
Joe
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Friday, February 3rd, 2023 AT 7:00 PM