How do you know its not running through the motor, can you see through the block, no its impossible so whats the problem? Overheating or something else? Get back to me cause i need a better explanation or unless you can give me a good reason on how you know the water isnt running thru the system. You would have to have a blockage which wouldnt let water circulate which would lead to overheating so is that your problem? If it is and you verify ill fix your issue.