I have an Alde compact 33010 heating system in my RV. I know that those have to have the fluid exchanged every two years. I'm pretty sure it is an old fluid type because it's yellow. Do I need to do anything with it before spring?
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Yes, it is every two years. You will get the new universal fluid - ALDE Antifreeze - Heat Transfer Fluid for Hydronic Systems. Greenish color