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I losse my coolant when driving and car overheats it will lose the coolant and return to normal temp or about half way between on gauge, Its not coming from around the waterpump, hoses and there's no leak in the oil, so would it be the thermastat not working right and not letting the water circulate
Has your check engine light turned on....and is still on? if no light is on its a leak on your radiator or as simple as the radiator drainer loose. those radiators are made of plastic and are not made to last! good luck!
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If your 2012 BMW 535i is losing all of its water but not overheating, there could be a few possible causes:
Leak in the coolant system: The coolant system of your car may have a leak, which is allowing the water to escape. This could be caused by a faulty radiator, a leaking hose or a cracked engine block.
Evaporative loss: In some cases, the water may be evaporating due to high temperatures. This is common when driving in hot weather, and it can be caused by a malfunctioning pressure cap or a faulty radiator cap.
Leak in the water pump: The water pump may be leaking, causing the water to escape from the coolant system.
Leak in the head gasket: A leak in the head gasket can allow coolant to leak into the engine oil, causing the water to disappear.
Usually a bad water pump will cause the engine to run hot with or without the ac being involved. The most common cause of overheating with the ac on is not enough air flow thru the radiator.
You may have a blown head gasket. Are you losing coolant? 1st check to see if your coolant level is good, if it isnt make sure you top it off, run it for 20 minutes watching the temp. and putting the heater control to full hot to be sure you bleed out all the air that may be in the system, after 20 min or when the temp rises too hight turn it off, let it cool, open and top off as needed, repeat after topping off, do this till it no longer takes any more coolant and is no longer overheating. If your still overheating and slowly losing coolant you more than likely have a blown head gasket, they have a sniffer test you can do at the radiator cap your local parts store carries them or your local mechanic can run the test.
You stated Coolant disappearing then I add coolant and stops overheating? If no puddles under car, check oil dipstick and see if it has coolant mixed witht the oil for a gasket problem. If no coolant you may have a bad radiator cap and losing the coolant as you drive. The pressure and pump will force it out as you are driving to where you are not aware of it.
you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...
If it overheats unless you are moving, there is an airflow deficit.
If the switch to run the fan does not turn it on until the engine is too hot, then you probably need a new fan switch.
I might think that the fan only covers a portion of the radiator, and there is only sufficient cooling surface area when the whole radiator is involved, but the fact that moving the car generates so much more heat than idling does would seem to counter that idea.
If you were losing (not loosing) coolant, there would be problems while driving as well.
It is also possible that your radiator's coolant flow is barely adequate, due to clogging. It might be a good idea to have that professionally checked.
You say it's overheating, more info needed such as: Is the engine temp gauge showing that it's overheating? Is it actually 'boiling over' and losing coolant? If it's running hot, but not losing coolant, check to see it the cooling fan is operating when the engine temp rises. You may have a bad cooling fan switch that is not signaling the fan to go on to lower the engine temp. It could be a stuck (closed) thermostat that is preventing proper circulation of coolant after the car reaches operating temp.
Check all radiator hoses and the radiator itself for small leaks. You could try an over the counter stop leak to see if that helps. On big leaks this is not recomended , but in small leaks it could svae your car from losing any more anti freeze.
Martin, You should replace your fan motor. One fan is for ac and one is for normal driving without ac. Your car is getting to hot. Hope this helps, these fans are available aftermarket as a whole assembly. Check out ebay I have seen them on there I have a wholesale company I buy them through.
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