Engine temperature
Hi,
my audi is a 2.0 liter turbo diesel 2013 year model. on a highway engine temperature usually go up to normal 90C and stays there, but as soon as I start driving in the town or when I stop, it falls to 50-75C . Is this a thermostat related problem or more like sth else? just bought a car so not sure when it started doing so but I see this is not normal as well as MPG isn't.
Thank you.
my audi is a 2.0 liter turbo diesel 2013 year model. on a highway engine temperature usually go up to normal 90C and stays there, but as soon as I start driving in the town or when I stop, it falls to 50-75C . Is this a thermostat related problem or more like sth else? just bought a car so not sure when it started doing so but I see this is not normal as well as MPG isn't.
Thank you.
My car has 100000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. In most cases, the engine’s operating temperature will decrease during normal city driving as this is usually when the thermostat opens and allows the radiator to circulate coolant through the motor and to be cooled by the fans. On many newer Audi’s and other foreign vehicles, the thermostat will open slightly during highway driving to increase fuel economy (as the running radiator and fan cause more strain on the engine and thus will reduce fuel efficiency). I’d say that the issue you brought up is normal and you should be OK to continue driving your Audi. If you notice that the temperature starts to climb above that 90 C temperature range consistently, contact one of our professional mechanics to complete an engine is overheating inspection.
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The temperature from a vehicle`s thermometer should be 200° F if the coolant system is functioning correctly.
Normal coolant temperature will be around 195 to 220 Fahrenheit (approx 90°C) and anything above or below this can start causing problems.
Normal coolant temperature will be around 90°C (approx 195 to 220 Fahrenheit) and anything above or below this can start causing problems.
The average engine operating temperature lies between 75 to 105 degrees Celsius. Anything lower will make the fuel economy suffer and increase emissions, while a higher temperature will lead the engine to sustain damage.
The thermostat is a gatekeeper. It controls the flow. Thermostats are rated on the temperature at which they begin to open and allow coolant to flow through. This opening temperature is usually 195 degrees Fahrenheit on cars.
Most car thermostats are rated to begin opening between 180 and 195 degrees and will reach the fully open position around 20 degrees higher, allowing coolant to flow between the radiator and engine.
The coolant level should be between the F(full) and L(low) marks on the side of the coolant reservoir.”
Most engines are designed to run with coolant temperatures between 160 degrees and 200 degrees. If temperatures in your engine stay too cool combustion will have to be too rich to keep things running smoothly.
For most of the modern car, the normal operating engine temperature is in the range of 75 to 105 degrees Celsius. When it reaches 80-90 degrees, the thermostat allows the cooling fluid flow through the other cooling circuit. If the temperature continues rising, the radiator fan starts cooling the engine.
The engine coolant is overheating if it`s around 240 to 250 degrees. This is a critical light! It means your engine is beginning to overheat.
During normal driving, the engine coolant temperature stabilizes at 100 °C (210 °F) or less, and the gauge indicates a range lower than 100 °C (210 °F).
Your car`s engine needs to reach an optimum temperature in order to run correctly. In most cars, this temperature is around 90°C. Failure to reach this temperature results in decreased engine power and efficiency. Low engine temperatures are usually caused by a problem in the car`s cooling thermostat or cooling system.
What Is a Typical Thermostat Setting? A typical thermostat setting is between 68° and 76°. Where you choose to set your thermostat might depend on the season as well as your own personal preferences.
Once the temperature of the coolant rises to between 180 and 195 F (82 – 91 C), the thermostat starts to open, allowing fluid to flow through the radiator. By the time the coolant reaches 200 to 218 F (93 – 103 C), the thermostat is open all the way.
For example, a 180 degree thermostat begins to open within three degrees of 180, so 177 to 183. By 200 degrees, the thermostat is fully opened. The operation of the thermostat, open to close, is a range of about 20 degrees, so with different temp ratings, you can fine-tune the run temp of your vehicle.
The thermostat helps control the engines temperature.
The thermostat in the Audi A4 is sealed in the housing and cannot be replaced separately. The thermostat on the Audi A4 is locating in located below the intake manifold and behind the alternator.
The mixing ratio of water and antifreeze should lie between 60:40 and 50:50. This usually corresponds to antifreeze protection from -25°C to -40°C. The minimal mixing ratio should be 70:30 and the maximal 40:60. Further increasing the proportion of antifreeze (e.g. 30:70) does not lower the freezing point any further.
A 50/50 mixture of antifreeze and water is the standard recommendation for most applications because it provides the best all-round cooling protection and performance for most applications. Premixed antifreeze is 50/50 and takes the guesswork out of correctly mixing antifreeze and water.
A low-temp thermostat gives the cooling system a head start. This will help to prevent Engine Detonation and overheating.
The most common reasons an Audi A4 is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. Coolant leak (water pump, radiator, hose etc.)
Most experts agree that your engine should run between 195 degrees and 220 degrees. In ideal situations, your needle will maintain a posture right in the middle of your gauge. Keep in mind that this can go up or down depending on the conditions in the vehicle itself (such as running the air conditioner or heater).
Step 1: First off, open your car bonnet to reveal your car engine. Step 2: Then look for the car engine thermostat. Go over to your car and put on the ignition, so your car engine warms up. Step 3: Take out your infra-red thermometer, aim the thermometer on the engine thermostat to take the temperature readings.
Start your car`s engine and allow it to idle. Look through the radiator filler neck to see if the coolant flows. At this time, it should not be flowing as your car has not reached the operating temperature to cause the thermostat to open. If you find the coolant is flowing, it means the thermostat valve is open.
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