Let start start with gathering our data from physical inspection first :
1. After the engine has cooled down and the coolant level was checked,it was discovered thst the cooling system was drastically low in coolant.
2 the radiator fan was runing direct
3.No evidence of leak of coolant was found on any part of the engine bay
4. Sorry for the use of word "coolant" cos customer is using water ( another red flag )
Lest we forget repair history too from the customer, repair history data is too important neglect .
1. Customer just gotten the vehicle few weeks back,and this same issue has occur like 3 times inside traffic and no repair yet done by him ( according to him )
Data ,data ,data and more data, the more the better for better decision making welcome to world of data analysis for automotive application .

Let now replicate the problem by runing the vehicle till we can now experience the same complaint customer made .
Just at that particular situation,we can retrieve the following pids on our scan data
1. Engine coolant temperature ( to confirm the temperature)
2.Ignition timing ( engine pinging)

Lest I forget let retrieve all the dtc codes that is found on the memory to see if we can get a lead from there as well, remember quantity and quality of data gotten made a lot of difference for better analysis .let limit to the engine section only

Going tru the list of dtc paraded by the scanner, we can see codes related to engine temperature.wait a minute, timing code is even among the list of codes retrieve!!!! ,is it part of scope of customer complaints, ?? How does the particular code affect the complaint at hand ?
we will need to perform further test to see how the effect on the complaint if it part of the complaints or a fresh hidden issue .

Following

Can you help diagnose why car overheats. Car was bought without thermostat and fan turns with ignition start.

Took car to a vendor workshop to put d thermostat and restore fan to factory setting. They put different thermostats but car crosses middle mark and moves to danger zone on idle.

No leaking of coolant, one of the codes point to "cold start switch" which was replaced but no headway yet.

The O2 sensors have been replaced before, don't know if the thermostat is d cause of the code coming back.

Tired and helpless

Engine performance

aryzgreat:
Following

Can you help diagnose why car overheats. Car was bought without thermostat and fan turns with ignition start.

Took car to a vendor workshop to put d thermostat and restore fan to factory setting. They put different thermostats but car crosses middle mark and moves to danger zone on idle.

No leaking of coolant, one of the codes point to "cold start switch" which was replaced but no headway yet.

The O2 sensors have been replaced before, don't know if the thermostat is d cause of the code coming back.

Tired and helpless

unfortunately all data supplied here can not suffice for the overheating complaint,
Vehicle will need to be seen physically to conduct further test. Are u in lagos

Lastly

autologic:

Vehicle will need to be seen physically to conduct further test. Are u in lagos

No, Edo state.

Any trusted recommendation?

So educative thread

2special:
So educative thread

Thanks sir

Happy new month everyone
Let me use the opportunity to update the thread .

From where we stop, we are on the scan data and we want to replicate the overheating complaint by confirming truly if it is so.
So running the engine for some for considering length of time and at the same time monitoring the engine coolant temperature data pid on our scan tool .(there is no temperature indicator on the dashboard
This is the result we got shown in pix below

Analysis of pix above :
The coolant temperature pid on the scandata was able to get to 107 degree as depicted on the picture and even continue to rise further till the extent that we even have to stop engine so as not to create further issues.
Hence with this little experiments, we have been able to prove beyond reasonable doubt that the vehicle is indeed overheating .
And with this data too we can actually use it as a guide when the issue has been successfuly resolved .
As one of my mentor says " let your data guide all your troubleshooting step and you will record greater success

It's normal for a car on a tired hold up to be overheating but when speeding the temperature will be normal

Jademimah:
It's normal for a car on a tired hold up to be overheating but when speeding the temperature will be normal

Vehicle will normally generate more heat on idling but will generate less when on speed cos of increase of ramp air that flow directly towards the radiator and the rest of the cooling system and so to compensate for this increased temperature, the fan will automatically come on to bring the temperature down to optimum value which means it a system under controlled .
But in your case of overheating on idling ,something is definitely wrong,the controlled system has been compromised with fault and like I always point out ,let have some metrics of the overheating by retrieving data of the highest temperature attained issue to aid decision making .
Hope I am able to address your question well .

Jademimah:
It's normal for a car on a tired hold up to be overheating but when speeding the temperature will be normal

Not normal. But run a quick test, when in hold up and temp rising, put car in neutral, rev the engine to about 1500 rpm and keep it steady for about 30 seconds, if the temp comes down, then your water pump is bad.

Let continue from where we stop with the case

Following.

Having confirmed the car is truly overheating, we can now link it to engine knocking sound the customer complained about .From knowledge of theory, increase in engine will increase the combustion temperature in the engine cylinder that will eventually lead to extreme explosion of the air fuel mixture charge in the cylinder sending huge vibrations effect that will be experienced in form of engine knocking sound commonly referred to as ,detonation or engine pinging.( not complained of all odd engine sound is mechanically inclined )
The ecu will make use of the "knock sensors " to get to confirm engine pinging triggering the ecu to react accordingly .( story for another day ). All these actions can be monitored tru the scan data pid ," ignition advance " depicted below (enough of technical gibberish,sounding ver ).
Welcome to the world of action and reaction, In today vehicle ,every system is interconnected and they are always trained to each other and every action will on a particular system will alway trigger reactions in other systems. thus it is imperative for nowadays automotive technicians to become all-rounder technicians to be trained in all aspects of sciences and engineering fields ( engine, fluids mechanics ,electrical ,computer and even hvac etc ) to handle the 21st century vehicle ,no room for assumptions and arm- chair guess talk, you need to get trained enough to test,test, test till you hit it or else you will miss it big time .This is just the reality.

Just in case you've battled overheating without any success, find time to check the coolant hose(s) attached to the throttle body of your car.

If you use coloured coolant in your engine cooling system, you'd notice this sort of colourations, dependant on the coolant colour around the small coolant hoses there, indicating a leak!

Hope this helps?!

TRYGO:
Just in case you've battled overheating without any success, find time to check the coolant hose(s) attached to the throttle body of your car.

If you use coloured coolant in your engine cooling system, you'd notice this sort of colourations, dependant on the coolant colour around the small coolant hoses there, indicating a leak!

Hope this helps?!

Thanks, it do help if the leak is from the throttle body coolant hoses.