Question about BMW 318

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My BMW 318i SE (P-reg) overheats straight away when driven.Both oil and coolant levels are at required levels,however interior heaters will not blow warm air even when on full blast warm and radiator fan remains off even when engine is overheated and steaming hot.Cannot find any leaks on pipes or radiator etc.Please can you shed any light on what the problem could be.Thanks

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  • mark_orwell Feb 04, 2010

    Thanks for your help.Can you tell me where the thermostat is located please as i don't have a clue.

  • mark_orwell Feb 04, 2010

    Thanks for your advice,i found it very helpful.Please can you tell me whereabouts the thermostat is located in my car's engine.

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There is a lot of things that may cause this situation,the thermostat not opening is my first guess.The coolant sensor senses the hot,218 degree coolant as it touches the sensor.But ,if the thermostat is not opening(stuck closed) ,then the sensor cannot sense the hot 218 degree coolant because it has not got to the sensor.This sensor is what tells the computer to activate the coolant relays,witch in turn,power the coolant fans.If the coolant does not flow threw the thermostat,it can not go threw the heater core,that warms the inside of the car.I hope this is helpful,and if so,please let us know,thank you.

Posted on Feb 04, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Feb 04, 2010

    All I know on this model,at the hose where it attaches to the engine,or the bottom hose,there is a bleeding process that needs to be done also,so It might not be a bad idea to have a shop do this for you,it is messy,and can be hard to get the air out of the cooling system.It should not be a lot of money involved,just tell them to change the thermostat.

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2 Answers

My car overheats even after you drive only 5 kilos. What could be the problem


two liquids regulate temperature i the car - oil and coolant. you need to check both, as you did not bother to think and provide us with manufacturer,model, fuel type and year, only general info can be provided.

oil - check level and change/top up as required, if change required - change oil filter as well while you are at it. change for type of oil required for your vehicle, oil and filters should be changed every 5000km (3500miles) to 10000km (7000miles), this depend on the condition, driving and age of the engine.

coolant - check level, top up f required.

if oil level is correct, and no loss in coolant either, you need to check coolant flow, start investigation if pump belt is not too lose and tension it if required, cannot do that if pump is driven directly from the shaft. check for thermostat problem and change if required, lastly - check radiator flow and reverse flush if required.

if you are flushing radiator - best is to flush block and heating system as well at same time, drain liquid and re-fill with new coolant.

hope this will help you at least a bit - do not forget to vote... :-)

Apr 10, 2015 | Cars & Trucks

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Your Car Overheats! How To.


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Check the oil level and the first thing in color is normal. Normal oil is usually shades of brown to black in color. If the oil is white or gray color is your car to the failure of more than initially seemed to have happened. This means that the block head gasket is damaged. When the oil is decent, and then check the oil level is the norm following. Is the coolant level is normal. CAUTION not to check at a time when the engine is warm or hot. If you find that the coolant level is low, add it. If coolant levels are normal, check whether the car interior heater blowing hot air or not. If you do not blow hot air then it is probably the air inside the cooling system. The system should be discharged from the air. However, if the cabin heater blows hot air then you should definitely check the thermostat. Each car has a sort of thermostat to be tested, and they differ in the parish. If you still have not solved the overheating problem, described the situation may have a defective cooling fan or a cooling radiator for the accuracy of work capacity. Definitely happy to answer all your questions. Please note that cold weather is had different error character. In this case, please consult with experts before.

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add coolent, your coolent is low your heat will than return dont forget to check for leaks. cooling system should be tested with a cooling tester.you may have to take it to a radiator repair shop to have it tested..

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If your car is loosing coolant, there might be an exterior leak, or an interior leak. First check and make sure that radiator cap is tight and the rubber sealer is intact, there can be many other reasons ...hole in the coolant hose, leaking radiator, heater core, water pump, intake manifold and more... Check and see if there is any puddle of coolant on the ground, if so you can find where the coolant is coming from.
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