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Hisun 500 engine thermostat

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Hisun 500 having overheating problem after water pump install. Should  engine have a thermostat ? Has a thermostat housing but no stat, parts diagram showed it doesn’t. If it does where would I get one if Hisun doesn’t offer?

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I don't see how a thermostat missing would cause overheating. The thermostat is used to get the motor to heat up to operating temp, so you can run a heater, etc. Lack of a thermostat would cause it to run too cool. 

  I'd look for other problems, like the water pump impeller running backwards. It has to push water in a certain direction, or it doesn't work right. I had a jeep that had this problem. The parts house gave me one to fit a serpentine belt. Which went underneath the bottom side of the pulley. Turning it the opposite direction.

Or an air bubble in the system. Today's cooling systems have to be "burped" sometimes. Especially foreign cars.

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I understand operation of thermostat. The question I was asking was why do you call it thermostat housing if one is not there from factory.  Impeller is going the way the engine is turning, no belts. Have bleed air, it just won’t move water to radiator to cool by fan which is controlled by temp which water not moving to radiator will not activate fan. Ordering a new water pump which I see nothing wrong with this one. It is one of very few parts that can be ordered. 

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The engine block casting process is pretty standardised, and would need to have some sort of piece to attach the coolant hose. So they used a typical thermostat housing. That way they don't have to engineer a hose nipple. Then pay to have it manufactured, which would only increase costs. The thermostat housing can be easily sourced. And it's common in any manufacturing industry to source common, non- propietary parts from elsewhere, and not manufacturing in- house. So it's natural to call it what it is, even though it doesn't actually contain a thermostat. That would be my guess.

     I'm sure that you could put one in there if it has the relief cut around the rim. So that the thermostat would properly seat, & seal. Although that wouldn't help your overheating problem. My guess would still be a water pump problem, or air in the system. Of course, not examining it personally, I can't totally rule out a blockage in the system, a clogged radiator or internally collapsed hose or something. But that seems extremely unlikely, and I trust that you've eliminated those possibilities.

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I understand operation of thermostat. The question I was asking was why do you call it thermostat housing if one is not there from factory.  Impeller is going the way the engine is turning, no belts. Have bleed air, it just won’t move water to radiator to cool by fan which is controlled by temp which water not moving to radiator will not activate fan. Ordering a new water pump which I see nothing wrong with this one. It is one of very few parts that  is available. This pump was put on by someone else and leaked oil and water. I pulled and found no gaskets orings. New orings installed, back flushed radiator also visually seen propeller turn with water pushing through. How’re ever I did notice impeller would move in and out like it was spring loaded.  It must be springing out and gear no connecting pump shaft is only thing i can determine.  How many degrees is hot? Curious cause can open bleeder on thermostat housing and it streams out. 

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