The temperture gauge did not work for 2 years then it started working by its self. Then after about three months of working normaly it just goes straight to very hot mark after a minute or two of the motor running. Have replaced the thermostate and given the radiator a flush.still the same problem. could it be the water pump or the heat sensor
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.
Radiator blockge when car is hot check the top radiator hose mast be busted check botom and top hosewhen engine is hot for same heat and presure by squese whith your thumn top hose hot is radiator promblem try 1/2 radiator flush for3 days
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