Any of several components in the cooling system can be at fault. If the thermostat is stuck closed, coolant will not circulate to the radiator to be cooled. Even in 25 degree outside temperatures, the engine can overheat due to this. In rare occasions, the water pump impeller can separate internally from the pulley shaft. While the water pump may appear to be spinning on the outside, the impeller may not be moving at all on the inside. So just as with a stuck thermostat, coolant will not circulate. There can also be cracked head gasket causing the overheat as well as the intake manifold and/or gasket. Coolant does circulate through the intake manifold and are prone to failure.
If the coolant is not flushed on a regular basis – I am aware of GM recommendations with their Dex-Cool coolant but still recommend a coolant service every 2-3 years – as it ages, the coolant can become gel-like and corrosive. Also, mixing coolants (green coolant added to the red Dex-Cool) can create issues as they react badly to each other. and clog coolant passages. That can degrade the intake manifold or gasket.
Have a certified technician look into the overheating as soon as possible. Continued operation while overheating will damage the engine.
How to Identify and Fix Common car Problems ?
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The most common reasons a Chevrolet Malibu is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
One common reason engines overheat while idling is a faulty or broken cooling system. This could include problems with the radiator, water pump, or fan belt. If any part of your car`s cooling system is not functioning properly, your engine may be at risk of overheating.
In general, it`s because something`s wrong within the cooling system and heat isn`t able to escape the engine compartment. The source of the issue could include a cooling system leak, faulty radiator fan, broken water pump, or clogged coolant hose.
Cooling System Leak – This is probably the most common cause of an overheating engine. If any component in your cooling system–which includes your radiator, hoses, water pump, head gasket, and thermostat casket–starts to leak, you`re in trouble.
Most thermostat are between 175-190. That`s the temp range for the thermostat to open and cycle the coolant through, the cooling system. 6 people think this is helpful.
If you find that you`ve got a car running hot but not overheating there might be a few reasons: Clogged or damaged radiator. Low coolant level. Damaged water pump or thermostat.
An engine temperature over 220 degrees Fahrenheit is considered overheating in a car, though some cars are better at handling excessive heat than others. Engines run between 195 and 220 degrees Fahrenheit. If the car is operating within this range, it is not overheating.
Normal coolant temperature will be around 195 to 220 Fahrenheit (approx 90°C) and anything above or below this can start causing problems.
Sign 1: Temperature Gauge
While you might be tempted to think this reflects the outdoor temperature (some cars have this feature, too) the temperature gauge reflects how hot your engine is. When you see it rising towards the red temperature indicator, your engine is overheating.
How long can a car overheat before damage occurs? It only takes 30-60 seconds of overheating for permanent damage to infiltrate a vehicle. As soon as you notice signs of overheating, you need to act. Failure to do so might result in troubles like coolant leaks, damaged radiator caps, and a faulty cooling fan.
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.
One of the first things you will notice is the temperature gauge is higher than normal. It may even start to fluctuate frequently. If you notice the gauge is hovering ¾ of the way from the top, then your thermostat is experiencing damage in the form of overheating. This can soon lead to your engine and car overheating.
With the engine off, open your hood and locate the water pump pulley. With gloves on, grab it and wiggle it back and forth. There should be no movement, if there is, this along with the noise is a good indication you may have a water pump problem.
When a water pump completely fails, it is no longer able to move coolant through the engine; this causes it to overheat. If you see steam, pull over immediately and call your mechanic for assistance — continuing to drive with an overheated engine can damage it to the point that it will need to be completely replaced.
If an engine “feels” cold, or “normal” but the dash gauge shows overheating, you could have a faulty temperature sensor and/or gauge. No cabin heat could be due to low coolant, blocked passages, faulty heater control valve and/or faulty blend door(s) in the dash ventilation network.
Not enough coolant: check the coolant level periodically. If the level is under the minimum level recommended, the engine may overheat because there is not enough coolant.