please what may be the cause of frequent overheating?

For a week now my Honda city has been experiencing overheating after I got a new driver. So he tells me he has to wait for it to cool then refill the radiator which would have been almost dry even though it was filled before starting the day. The radiator has been checked and it's not licking. It was washed because mechanic realised it was very dirty but still overheated same day. The AC is attached to the fan and I was advised to detach it although that has not been done. At the same time the battery also runs flat. What could be the cause? Mechanics seem to just be guessing. Sometimes my
Experienced mechanics share their insights in answering this question :
Hi there:

There are several problems that cause an engine to overheat; but it’s rarely the driver. If the radiator is needing to be refilled, there is a leak somewhere; most likely internally. If coolant is leaking inside the engine, it may be caused by a blown head gasket, cracked engine block or other serious engine component issue. It’s also possible that the water pump is not functioning correctly; or is leaking as well while the vehicle is driving and water pump is engaged. It’s best to have a professional mobile mechanic complete a car is overheating inspection; so they can determine why you’re having this issue.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Overheating can be caused by a: Cooling system leak – This is the most common cause for a car to overheat. The radiator, hoses, water pump, head gasket, and thermostat housing are all components of the cooling system, and all can be susceptible to leaks.
The most common reasons a Honda Accord is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
If your car is overheating, you should pull over at the first safe opportunity. Don`t touch the hood until you`ve given the vehicle at least 30 minutes to cool down. There are many reasons why a car would overheat, but issues with your coolant or your radiator are the most likely causes.
Why is my car overheating but it has coolant in it? It could be that the coolant concentration is not correct, or you may have a bad thermostat, a failed water pump, broken drive belt, or a bad radiator or radiator fan.
Technically speaking yes you can use plain water in your cooling system but it isn`t recommended as a long term solution and certainly not in extreme weather conditions.
If your vehicle`s engine overheats, it could be due to failing spark plugs. Overheating can happen for a number of reasons that can cause your engine to be too hot. This can harm your engine parts and lead to expensive repairs down the line.
First of all, driving an overheated car can do more damage and make the problem worse. And secondly, even if your car does eventually cool down, it`s not necessarily safe to drive it. So, if your car ever does overheat, it`s best to pull over and call for a tow truck.
It gets even more concerning and confusing when car overheating suddenly returns to normal. This phenomenon can happen for many reasons, like a bad thermostat, a faulty radiator, or a coolant leak. As such, it`s best to get your car checked by a professional— like RepairSmith!
If the coolant tank is full, the problem may be electrical or mechanical in nature, in which case a tow to the nearest repair shop is definitely in order. A leaking hose, worn or broken fan belt, bad water pump, or malfunctioning thermostat may be the culprit.
Why is my car overheating but it has coolant in it? It could be that the coolant concentration is not correct, or you may have a bad thermostat, a failed water pump, broken drive belt, or a bad radiator or radiator fan.
There are a variety of reasons that a vehicle can overheat, such as cooling system leaks, blocked hoses from corrosion and mineral deposits, radiator issues or broken water pumps. Regular inspections may help avoid overheating issues down the road. Come in today for a consultation on your coolant/antifreeze fluid.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

please what may be the cause of frequent overheating?
ANSWER : Hi there:

There are several problems that cause an engine to overheat; but it’s rarely the driver. If the radiator is needing to be refilled, there is a leak somewhere; most likely internally. If coolant is leaking inside the engine, it may be caused by a blown head gasket, cracked engine block or other serious engine component issue. It’s also possible that the water pump is not functioning correctly; or is leaking as well while the vehicle is driving and water pump is engaged. It’s best to have a professional mobile mechanic complete a car is overheating inspection; so they can determine why you’re having this issue.

What causes my car to keep overheating?
ANSWER : Thank you for writing in! Typically the thermostat and water pump are the primary sources of overheating on a 1997 Toyota Corolla. However, since the fluid never left the reservoir, it could be caused by a blockage in the coolant tubes; such as an air bubble. A good bet would be to have one of our local mechanics complete an overheating inspection. This would reduce the frustration of guessing and allow them to pinpoint the source of your issues; so that they could be fixed sooner rather than later.

Best of luck!

My 2009 Equinox is overheating intermittently. It overheated in the summer and tnen not again for 3 months then twice in one week
ANSWER : Check the coolant level to be sure it is adequate. Of course, if the coolant level is low enough to cause overheating, you may have a coolant leak. If the overheating is intermittent that would point to a possibly sticking thermostat, malfunctioning controls for the cooling fans, or the fans themselves, and possibly an engine operating condition such as an excessively lean air fuel ratio. Other common causes of overheating include low coolant level, a plugged radiator, collapsed hoses, and a faulty water pump or drive belt. Certain engine faults, such as a leaking head gasket or poor engine running condition can also cause overheating. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Can an overheated engine cause a knock sensor to fail?
ANSWER : The short answer is: Yes, this is possible. Knock sensors, and many other engine sensor types, have coiled electrical wires, which can fracture with heat and vibration, causing them to malfunction. Although this kind of failure usually happens over time, since your vehicle is a 2008, this may have been coincidence, may have been "one last stress" on the knock sensor, or a completely new failure. In any case, this is well within the realm of the possible.

I would recommend having the Check Engine Light inspected by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

Does blocking heater horses causes overheating?
ANSWER : Hello. If the heater hoses are an integral part of the cooling system, as is the case with most vehicles, then blocking them off can indeed result in engine overheating. Blocking off hoses that are a part of the cooling system can prevent flow, which can quickly lead to overheating, and serious engine damage. Depending on the cooling system setup, some heater hoses can be bypassed, which will cut off flow to the heater core, but still allow flow through the system.

If the heater hoses are leaking, I would recommend having a professional technician, such as one from YourMechanic, visit your location to diagnose the overheating issue and replace any hoses as needed.

Overheating coolant reservoir has a pinhole in it. Is this the cause of overheating?
ANSWER : Hey there. If the coolant reservoir is leaking, then it could leak out enough coolant to cause the engine to overheat. The reservoir is known to get stress heat cracks and leak coolant. You might see a small pinpoint leak, but as the engine runs hotter it will push out more and more coolant.

I would suggest having the cooling system checked for overheating then pressure tested for the leaks. If the coolant reservoir is leaking, then have it replaced. Run the engine to verify the cooling system fans come on and the system does not overheat. A certified professional from YourMechanic can come to your car’s location to diagnose the leaking coolant if you need this taken care of.

My mechanic is saying the timing chain is bad (causing oil leaks). Does a timing chain cause oil leaks? What are your thoughts?
ANSWER : Hi, thanks for writing in. Timing change themselves cannot cause an oil leak but the timing chain cover can cause an oil leak. In order to replace the timing cover gasket, you will have to remove the serpentine belt and anything that has belt driven. This includes the alternator power steering pump air conditioning compressor and crankshaft pulley as well as the water pump. Once all of this is remove the timing cover can be removed and the gasket can be replaced. I would strongly recommend having this job performed by a professional as many parts are required to be removed in order to even access the timing cover. Here at YourMechanic, we can have a technician come to your home or office to perform this replacement for you.

Overheating and boiling out the reservoir.
ANSWER : Hey there. The next thing you need to do is confirm the thermostat is opening and test to see if the radiator is clogged or not. Begin by warming your car up. Don’t drive it, just let it idle or hold it on a high idle. Depending on the ambient temperature, this can take a half hour or more for the thermostat to open. You will know the thermostat is open by touching the upper radiator hose. The hose that comes off of the thermostat housing. When it begins to get hot, the thermostat is opening. The stat will cycle open and closed during the warm up process. A motor is not fully warm until the stat reaches a point of equilibrium. Meaning, it stays open at a constant amount. If your car begins to overheat and the upper radiator hose does not get hot, you will need to figure out what is going on with the thermostat. It could be installed wrong or even bad. I have had new stats be bad several times.

If the stat opens correctly and your car is fully warm, take it for a quick spin around the block. Come back to a stop in your driveway or other parking spot, turn the motor off, key off, open the hood and reach in and touch the radiator from top to bottom and side to side. You are feeling for cold spots. They will be obviously cold in comparison to the rest of the radiator. It is normal for the lower part of the radiator to be colder than the top. That only means the radiator is cooling as it should.

If after doing these two things your car still overheats, it is time to consider head gasket problems. You can use a block tester kit from your local auto parts store or you can book and appointment with us. Testing for head gasket problems can be cumbersome and only experience will allow you to make an accurate determination. I recommend a having an overheating inspection to have this accurately diagnosed and corrected.