If your fluid is foamy or if it has air bubbles in it make sure you have correctly bled the system for air. If you have and it is still foamy then this means your system is sucking up air while running. If your pump is making noise this is also made because of the air. If you have a leak in the system then you will have to fix the leak and this should solve the problem. If you do not have a leak it does not mean that the system is not sucking up air. You will have to check all of the fittings, crimps, and connections that are in your system to make sure they have a perfect fit. These are the most common areas for air to be sucked in. It is a hard task to find the air leak but if you have any questions always feel free to give Unisteer a call at 1-800-338-9080 and we will be happy to assist you.