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Hi, there could be a few things causing that like your water thermostat may need renewing , radiator may need a flush out, could even be your water pump has given up. If you flush the radiator stick a new rad cap on .
Drain the coolant when it is cold and pull off the upper and lower radiator hose. Put a garden hose in the radiator neck (after removing the radiator cap) and turn the water up gradually and let it run for 15 to 20 minutes or until the flow is constant. If your water pump is not noisy or leaking and the pulley is not wobbling then you should not have to replace the water pump. You may want to flush out the block with water also. Please rate me on this answer.
First, make sure engine is warmed up, then feel the top of the radiator hose, is it hot ?, if not then you may have a bad thermostat, replace with a 195 dgree, or you could have a bad head gasket.
Let me know what you find.
It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water
through the engine block and cylinder head and back through the
radiator. In the radiator the mixture is cooled when air passes over
the fins of the radiator. This is accomplished by driving or a
mechanical/electrical fan when stationary. The water pump also
circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving. I hope this helps and good luck!
Most likely the heat sensor.
Ensure you replace the gauge sensor with the correct type to suit your gauge.
(dont confused it with the overtemp alarm switch sensor).
Check you've got the right sensor by shorting it out to frame/ground and observing the gauge movement.
I had the same problem with my 95 Pickup when I got it a couple of years ago -- replaced water pump, thermostat, flushed radiator, etc. I finally noticed that the area where the radiator cap seats in the top tank (which is plastic) had a couple of gouges, which was keeping the cap from sealing properly. I cleaned it up as best I could, then bonded a large washer (used a grinder to get the exact size) into the neck for the radiator cap to seat on. Haven't had a problem since.