Question about 1996 BMW 318

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I have a bmw318 on a 94 plate have had the water pump checked the thermostat checked and had a new radiator fitted the system runs fine when cold but when reaching normal temp the hoses become solid and the header tank boils over do you have any tips or suggestions. many thanks ray

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Sound to me like you have a blown head gasket, try letting it heat up with header tank open and if coolant overflows when you give it a rev up this would tend to confirm it,check also for water in oil or oil in water, water in exhaust all point to head gasket or head crack problems.

Posted on Jul 06, 2010

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That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.

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1 Answer

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Thermostats in cars are often neglected, if not totally forgotten, units. Yet they play an important role in the general performance of cars by restricting water flow until the engine has warmed-up. Thermostats are heat sensitive valves that open and close. On cars they prevent circulation of coolant to the radiator until the engine is warm enough. When the thermostat is closed water only flows through the water pump and water jacket to let the engine warm quickly. When the thermostat opens, water can then pass through the radiator for general cooling.
google_protectAndRun("ads_core.google_render_ad", google_handleError, google_render_ad); Having a car that warms quickly is particularly useful in cold weather when you want to use your car heater as soon as possible. The thermostat is in a small housing positioned where the top radiator hose connects to the engine. The best time to check or change a thermostat is when you are servicing your radiator because you need to drain the cooling system
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It should be 200 degrees. If your running cold the only thing that regulates temp is the thermostat. If it is indeed 150 degrees thats why you have no heat.

If you replaced the water pump and the radiator for this condition then it was a waste of money. If you had a water pump or radiator problem it would overheat.

The fact that your blowing cold air tells me the that you really are 150 degrees or the heater core is plugged.

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1 Answer

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Did you install a new thermostat and make sure to bleed all the air out of the system when you replaced the radiator? If you didn't, or installed a Stant thermostat, replace it with a FACTORY OEM thermostat. Make sure the cooling system is bled by opening your radiator cap (WHILE THE CAR IS OFF AND COLD), starting the car and running the heater. Add coolant to the radiator as the engine heats up, until is at normal operating temperature AND starts spitting coolant back out.

Hope this helps,
matt
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