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2005 impala temp gauge not working light says overheating replaced thermostat temp sensor and bleed system. Any thoughts

Posted / edited by AnonymousUser on : 29-11-2021

Answers :

Remove the radiator cap, let the car run. When the car is at temp. and the thermostat opens you should see coolant circulating in the radiator. If there is coolant flow and you know for a fact that the engine is not actually hot,(check with a laser thermometer: point the laser at the engine block and read temp.) then you more than likely have a problem with the coolant temp. sensor. Check the connections, replace the sensor.
If you do not see coolant circulating in the radiator then you have an issue with either a thermostat, water pump or possibly a blockage or at worst a problem in the head. Check the overflow with the car running, if it is steadily "blowing bubbles" in the over flow (like someone blowing bubbles into a cup with a straw) then there is compression leaking into the cooling system and there is a problem with the heads. Remove the heads and have them checked for cracks at a machine shop.
If there is no "blowing bubbles" then I would remove the thermostat, run and check for circulation in the radiator again. If it is flowing, then replace the thermostat. No flow, Check the radiator with a laser thermometer. With the car at temp. point the laser at different areas of the radiator and see if you have "cold" spots. If you do then you have blockage at the radiator. If you have consistent readings across the radiator that is not "cold" then change your water pump.
I hope this has been helpful and helps you to solve your problem.
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