14
Mar
Ok if the sensor is reading wrong or has a bad connection it will flutter and if the computer which needs to know the temp to make it run proper sees a change it changes based on that temp so it will cause the fluttering. Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.
One of the first signs of all coolant temperature sensor symptoms you will probably notice is that the check engine light will show up on your dashboard.
Why does my engine temperature fluctuates. The most likely cause of a temperature fluctuations is either a flauty temperature sending unit air in cooling system or a defectective cooling fan. If the engine temperature is stable when driving at highway speed and temperature rises when idling or in traffic the fan is the cause. However as all car parts wear some malfunctions can cause your engines temperature to either go up or down or even fluctuate during driving.
You need to know that a certain range of fluctuation is normal but if the temperature fluctuates wildly youre looking at a. I saw this fluctuation only because I had my dashboard read-out looking at engine and transmission temps rather than my customary trip and leg fuel mileage read-outs. As I paid closer attention to the engine temp when the temp reached 210 F I could hear I think the radiator fan engage go into a higher speed and then disengageslow down when the temp reached 192 F.
2 Issue with the radiator coolant of the car. This could be caused due to insufficient coolant leakage of coolant damage to the radiator of the car. This will require extensive repair.
In this case it is advised to get the issue diagnosed and fixed at the earliest to avoid engine damage due to over heating. Engines do not rise in temperature and immediately drop so it is likely you have air trapped in your cooling system. Air rises to the top of the cooling system and gets trapped causing the cooling system to vapor lock.
When the radiator is positioned at the higher. As the temperature of the engine and hence thermostat increases the thermostat opens usually about 90 degrees or so and lets coolant flow throughout the engine and through the radiator this cools the engine. A bad water pump can also cause the car temperature to move straight too high.
A water pump pumps coolant through the cylinder head and engine block thus regulating the engines temperature. When your water pump develops a fault it will be unable to pump coolant throughout the engine. This invariably leads to engine overheating.
If there is no quick intervention the cylinder head. An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates. Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.
You didnt mention by how much the gauge fluctuates. When your thermostat is not working properly or is stuck closed this will not allow the coolant to properly circulate through the engine which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. When the thermostat is stuck open it can cause the coolant to circulate constantly resulting in the motor never reaching the correct operating temperature.
Ok if the sensor is reading wrong or has a bad connection it will flutter and if the computer which needs to know the temp to make it run proper sees a change it changes based on that temp so it will cause the fluttering. Longer version - The water circulating round your engine gets to temperature 100C. The water in your radiator is cold because of the air blowing over it.
If your engine gets too hot the thermostat opens and the hot water goes to the radiator and the cold water cools your engine. BlueDevil Proon February 19 2021 at 859 am. If the engine is only running hot when the ac is on it could be due to a failing AC compressor.
Because you didnt mention having an issue with the AC the problem is more than likely related to a flow issue in the cooling system. One of the first signs of all coolant temperature sensor symptoms you will probably notice is that the check engine light will show up on your dashboard. If the computer detects any problem with the sensors circuit it will illuminate the check engine light indicating that the car needs an inspection.
If you see a check engine light on your dashboard it is time to check the trouble. Why does my temperature gauge keep going up and down An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates. Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.
1992 Toyota Pickup. In May 2012 I had the thermostat changed to one that can handle hot high desert conditions because my engine was running hot. The mechanics in Arizona replaced the thermostat a cracked radiator cap flushed the radiator and added a special radiator fluid.
It diffused the problem although it ran hot when climbing hills. As we talked about the most common problem with a faulty engine temperature reading is the coolant temperature sensor itself sending the information to the cluster. Some cars have two temperature sensors while other car models have one.
The models with one sensor usually both use the engine control units temperature and the same sensor. When your truck reaches 190 the thermostat is opening and shooting cold wateranitfreeze into the motor and cools it down very fast hence the fluctuating then once it reaches 160 it closes back to allow the motor to warm back up then the process repeats itself my truck does the same thing and im pretty sure everybody elses does to expecially if you live in a moderately cold climate. Doesnt overheat but temperature fluctuates radically.
I first noticed problems when my interior front heater was changing back and forth form cold to hot and back to cold again then hot etc Im guessing there is a coolant flow restriction or insufficient coolant levels. Also the engine temperature gauge moves radiacally from cold to normal and. If the engine is running coolant is flowing through the heater core.
When you turn on the heat youre just blowing air across the heater core. You dont circulate any additional fluid anywhere by turning on the heat. Coolant temp fluctuation is completely normal and will vary with engine load and air flow across the radiator.
These are the reasons why your car engine overheats. Avoid doing these things and maintain the car temperature. Sometimes the car temperature gauge hot but engine cool means having a faulty head gasket.
The seal at the coolant combustion chamber and engine oil pass is not secure. Discussion Starter 1 Jan 14 2015. I have a temperature issue with my 20 pt cruiser it is inconsistent.
The temperature gauge reading is fluctuating from middle position to one mark under and again to the middle. I changed the thermostat radiator cap and temperature sensor but it didnt help. I also flushed the radiator with no effect.
The code indicates that a wire from the engine coolant temperature sensor is shorting to ground or open somewhere. Of course intermittent means. The engine computer in response turns on the engine cooling fans to lower the reported hot engine coolant temperature.
Oldschool July 5 2016 1003pm 9. It suggests that a plugged heater hose or heater core can cause engine temp to fluctuate. Until the problem is solved information like this could be the key to the solution.