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Hello, my name is Bobby. Thank you for the question. The main reasons why the the fluid will foam up is because the fluid either has moisture in it, it has the wrong fluid in the system, or there is a loose connection causing the system to suck in air. I typically start by changing the fluid in the system and adding the correct fluid to see if it takes care of it. If not then the connections and fittings need to be checked. I hope this helps. Please let me know if you need anything else.