bad thermostat or water pump
the hoses leading to and from your radiator might be clogged. If you had a rusty radiator, the rust may have clogged the hoses that carry the coolant. you should check all your hoses and even flush them out.
Sediment blockage. You need to have your radiator power flushed to get all the build-up out.
Thermostat stuck in closed position Water pump not working Cooling fan not working Radiator plugged defective radiator cap
First off check your fluid level, then look in the radiator with the cap off and the engine running and you should see the fluid moving, if not then suspect the water pump but the most likely cause is a malfunctioning thermostat. Your description leads me to this as the best guess if the radiator is not extremely hot or you suspect that the guage is saying it is hot when it seems pretty normal then the temperature sending unit may be the problem. you said always hot so I assume it means all the time like the guage never says cold.
If it just the fuel gage then your sending unit is not working or their is a broke wire between the tank and the gage. If all your gages are not working check for a blwon fuse.
Test the relay and the temperature sensor.
I presume you mean car water pump? If the water pump is faulty the car will over heat and the temperature gauge will go up. Make sure that there is enough coolant in the radiator, the radiator or the hose pipe is not leaking and the radiator cap is not faulty, as all of these faults can cause overheating. Once you have excluded these then you can blame the water pump.
The Radiator fan relay has probably failed. It is bolted to the lower side support next to the radiator.
If its burning a lot of gas its a vacuum leak make sure all hoses are connected.
In all probability you either have a bad radiator cap or an air lock.
You bet! keep that baby full at all times
first thing to check would be the thermostat in the engine. next check the radiator cap. also check that radiator hoses are good, and not soft.if they are soft they can colapse when hot, stopping the coolant from circulating check to see if there is coolant in the oil that would indicate a blown head gasket.