Pump gets very hot when it runs - Hayward 1.5 Hp Northstar High Performance Pump

All electric motors run hot and pool pumps are no different. But how hot is too hot for a pool pump? The first test is simply whether you can touch the motor or not. Under normal operating conditions, the motor end of the pump is hot enough that you can barely touch it - but not searing hot.

Best to you.

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the heater element is in the pump housing and needs the pump running so that the heated water is circulated to get it all hot
with no pump operation all that is getting hot is the pump housing area and that will burn out the element

the motor is bad overheating need a new booster pump

CHECK IF THE PUMP COUPLING IS THERE IF SO TRY BLEEDING THE RADIATORS UP STAIRS TO SEE IF U GET COLD OR HOT WATER N IF THE WATER IS DIRTY. THEY LINES MIGHT HAVE AIR IN THEM. IF U TRIED THESE N STILL NOT GETTING HOT U WILL NEED TO CHANGE THE MOTOR N COUPLING

the pump is pumping and circulating hot water into jacuzzi, it will get hot. I think it is ok

If you run out of gas in this truck it will quickly destroy a fuel pump, the electric pump is located inside the gas tank, it is tiny and to do its job it uses the gasoline it is immersed in for cooling, if you run the tank below 1/8 tank level the pump is going to run hot, if you run out of gas the pumps rotor bearings get very hot and if the pump gets hot enough the rotor seizes up. Also when you run out of gas it takes more than 1 gallon to get the pump to prime again, 3 gallons minimum is the least amount. The bottom line here is that you will more than likely need to pull the fuel tank and replace the fuel pump.

A motor can run that hot and still be within the temperature it can handle. It likely has an internal overload device that will shut it off if it exceeds that temperature. If you see something like "thermally protected" on the motor nameplate, you are ok. If it is getting noisy as it runs it may need servicing.

Sounds like the wire gauge (thickness) is to small

Radiator Fan Control Relay Switch. I bet your electric fan doesn't run?