My car does not start if it is heated up during previous runnig
I have Charade 1986. During summers, its temperature needle reaches to half which I think is normal. After running if I break for say 5 minutes it wont start till engine is cooled down. I have changed radiator as well as cooling fan but problem exists. Engine condition is fine. Can U help me diagnosing the defect
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Sounds like vapor lock. This is when the fuel turns into a vapor before reaching the engine (it needs to be in a liquid form). This is usually due to high temperature from the engine and environment. I would have someone check it out.
If your car is running hot after replacing the thermostat try flushing the radiator which will usually make the car run cooler. Antifreeze raises the temperature of cars a bit and is not needed during the summer months if you live in a warm area. Make sure you put some in though by the time it becomes winter. There may be a lot of gunk in there that is causing it to heat up especially if any radiator leak was ever added to the system.
On my slightly older Saab the radiator fan is electric and only is engaged when the temperature meter reaches 3/4 to the top.
When the car is in motion it will not spin since the air flowing through the radiator from the speed is sufficient to maintain normal engine temp. Only when the car is still it for a few minutes it may start to spin especially during summer, it will sometimes continue to spin even after the engine is turned off. This is normal behavior for this car.
To conclude, if your engine temp only goes up to half the gauge there would be no need for the fan to start spinning. If it doesn't engage during the conditions I described above there would be a problem that needs to be fixed.
It means that the pre heat is in operation.It is a system that burns diesel to create heat to warm up engine quicker so that warm air comes into car sooner.The smoke is the exhaust gasses from the system and normally the whistleing and smoke stops when engine reaches running temperature or on short journeys approx 1 minute after engine is turned off
During summer when no heat is required and air con is on cooling it should not light even when starting from cold
your radiator could be getting stopped up. also water pump could be weak. during summer though you have electric fans that should be working. need to check. you can purchase some stuff called water wetter by redline racing oil that will drop water temp 20 degrees which is substantial when a thermostat is usually 180 to 190 and boiling is 212.