Table of Contents
What diagnostic trouble code could be sad if the thermostat is defective?
While there is a small chance that there is an issue with the running temperature of your engine, by far the most common issue with trouble code P0128 is a faulty thermostat.
What can be done to prevent air from being trapped in the cooling system when the coolant is replaced?
What can be done to prevent air from getting trapped in the cooling system when the coolant is replaced? Use the coolant exchange machine that draws a vacuum on the system or open the air bleeder valves while adding coolant.
What permits coolant circulation through the engine when the thermostat is closed?
The thermostat is located between the engine and the radiator. This little temperature-sensitive spring valve stays closed during engine warm-up. When the thermostat is closed, it prevents coolant from leaving the engine and circulating through the radiator until the correct running temperature is reached.
Which of the following is an appropriate precautionary measure when the coolant temperature warning light comes on?
Which of the following is an appropriate precautionary measure when the coolant temperature warning light comes on? The radiator cap should not be removed when the engine is hot. Which of the following is a common cause of overheating in an engine?.
Under which of the following conditions can the engine overheat quizlet?
An engine overheats when the vehicle is parked, with the engine running. When the vehicle is driven at highway speeds, the engine operates at the normal temperature. Tech A says an inoperative electric radiator cooling fan could be the cause.
Why is a cooling system pressurized?
Pressure in a cooling system is vital for keeping water in contact with the metal surfaces of the cylinder heads and block. Pressure keeps the air compressed and maintains the water-to-metal contact that is vital to prevent localized boiling or steam pockets in the combustion chamber areas of the cylinder heads.
What type of pump is a water pump quizlet?
A water pump is a positive displacement-type pump. Water pumps ________. What diagnostic trouble code (DTC) could be set if the thermostat is defective?.
What way does coolant flow in a cooling system?
The coolant follows a path that takes it from the water pump, through passages inside the engine block where it collects the heat produced by the cylinders. From there, it flows out of the radiator, through the lower radiator hose and back to the water pump.
Will a bad thermostat throw a code?
the most noticeable issues occur when the thermostat gets stuck in either the open or closed position. a malfunction can result in a trouble code, generated by the engine’s computer, which can turn on your check engine light.
What does DTC P0128 mean?
Code P0128 stands for Engine Coolant Temperature Below Thermostat Regulating Temperature. It means that the ECM/PCM has “noticed” that the engine coolant temperature is consistently running below thermostat regulating temperature. In other words, the engine is running cooler than it should.
What causes airlock in car cooling system?
The most common cause of radiator air lock is a failure to maintain pressure. The cap not only makes sure there is no coolant spillage, but maintains the pressure in the system. If this fails at high temperature, air pockets can form. Air can also enter the system, causing air pockets to be caught inside.
What are 10 common causes of overheating?
Common reasons for overheating engines Too little or no coolant. Driving without proper levels of coolant/antifreeze may cause a coolant system failure. Cooling system leaks. A broken water pump. Radiator issues. Oil too low. Thermostat failure. Issues with the belts and hoses. Heater core is plugged up.
How do you check if there is enough coolant in the engine?
Generally, low and high markings on the side of the plastic overflow bottle connected to the cooling system tell you if there is enough coolant in the engine. The coolant level should be between the two marks.
How do you check coolant flow in a radiator?
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.
How do you fix coolant temperature warning?
If you are driving when this warning light goes on, pull over safely as soon as possible and shut off the engine to let everything cool down. Let the engine cool down for at least 30 minutes before attempting to remove the radiator cap and remember to use a thick rag to protect your hand when you do so.
Why does my car say check coolant level?
Seeing the “Check Coolant Level” warning on your dashboard is often a sign you’re about to have a very bad day. Your engine’s coolant — also known as antifreeze — is a vital fluid that keeps the engine’s temperature regulated, improving efficiency and preventing overheating that could damage the motor.
What causes a car to overheat while idling?
A Broken Radiator Fan If your car begins to overheat when idling, but the temperature gauge moves back down once you get going, it’s most likely due to a broken radiator fan. If the fan isn’t working, the engine will begin to overheat until more air flows over it.
