New Air Venturi compressor overheated

I setup my new Air Venturi compressor. I turned on the cooling system and turned on compressor. I watched the temp go to a very high 75 Celsius and turned off compressor. The pump was not pumping water. I pulled pump from water container and examined it. There is a screen on the bottom of pump. On the screesn is a piece of plastic that can be slid back and forth to cover intake hole of pump. It was closing intake and preventing pump from sucking water in. Why would they put something on a pump to close off intake? I slid it back from intake and now pump is working. I just thought I would give a heads up on this problem.
 
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It slides from full open to full closed. I don't think it caused any damage because I shut the compressor down when it reached 70 Celsius. If I hadn't been watching the temp it might have caused damage. I ran it after I fixed the pump and it ran low temp and built pressure to 4000 psi. I felt like that was enough testing for now. When I get my secondary air filter i'll fill one of my tanks.
 
Without actually seeing one it does sound like a simple aquarium or fountain type pump which in some instances have a small slider to adjust the pumps output. These are universal type pumps with many applications. On several outside fountains that I have I clean these pumps a couple of times each season by running them in clear clean water and light brushing with an old toothbrush. Outside use in a garden requires this but I’d suspect it would just be something to check periodically to insure a good water/fluid flow. 
 
"Centercut"So the pump used on the AV is a sump type pump that is located in a tank or container of water? And that pumps out of the container, through the radiator, through the high then low pressure cylinders, and back to the container? Just confirming for ideas for my Tuxing cooling system modifications.
Yes the pump is submerged in the tank (fountain type pump). Actually the flow should go from Tank/pump to the high pressure cylinder then the low pressure cylinder then the radiator THEN back to the tank.


Thurmond