Eather temp senser or thermostat.
less than £10.00
coolant temp sensor,does just what it says,it relays your coolant temp to gauges!
Have you had the coolant temp sensor checked? It might be that the engine is running hot but the sensor isn't showing the temp is hot.
where is the coolant temp sensor on a 2004 1.5 almera
located coolant temp sensor
how do you replace coolant temp sensor on a rodeo
P0128- coolant thermostat ( coolant temp below regulated temp)
most likely is do to air being traped in coolant system after replacement . and the air is being purged out as the engine warms up to operating temp ..
Replace the coolant temp sensor
Could be a failed engine coolant temperature sensor. Easy enough to replace and not too expensive.
The coolant temp sensor is probably doing its job. You may have other issues such as being low on coolant or a thermostat going bad.
A flashing temp gauge light in a 2002 VW Polo typically indicates that the engine is overheating or there is an issue with the cooling system. This could be due to low coolant levels, a malfunctioning thermostat, a faulty water pump, or a blocked radiator. It's important to address this warning promptly to prevent potential engine damage. If the light persists, it’s advisable to check the coolant level and have the vehicle inspected by a mechanic.