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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-28-2005, 03:52 AM   #1 (permalink)
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Leeking coolant...not sure where its comming from.

After I arived to work i seen steam comming from out of the gril. smelled like radiator fluid and kind of checked it out. After I got home I started taking things apart but I cant find out where its leaking from. It leeking from under the throttle body area and you can see fluid all over the place. the hose that runs from the coolent tank looks fine in the areas where it would seem to be leeking. is there anythings else that I might be missing?
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Old 12-28-2005, 08:25 AM   #2 (permalink)
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There are many coolant hoses in that area. A good flashlight will help. Check the heater hoses carefully, they run from the front under the throttle body, to the firewall above the starter. There are hoses which go to the throttle body as well for air/fuel heating. Check these too.
Preasure builds after a warm engine is turned off, and the leak will be more pronunced at that time.
Check the service manual for a pic of the thermostat housing for an idea of where the hoses are located.

Be carful not to tug on a rotted hose while the engine is hot! Wear gloves and eye protection!

Good luck

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Old 12-29-2005, 10:26 AM   #3 (permalink)
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i honestly dont know where it might be leaking from but my best suggestion would be just go all out and either change all of the hoses or if your car is due for a timing belt change go ahead and change your timing belt and other belts if needed and in order to change your timing you have to take off the hoses and radiator so while you are changing belts you can closely inspect the hoses for cracks or what not and if has nothing to do with hoses then just look for a calcium residue on the engine somewhere or around the water pump you just might have a bad water pump but either way in order to find out if its the hoses or the water pump you are still going to need to take all the coolant hoses and radiator and of course the clutch fan it sounds like a big job but honestly its really quite fun and this is coming from a sixteen year old kid now dont think that im sixteen that i dont know anything because i have already changed all of the belts on my car and i changed a water pump for a friend
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Old 12-29-2005, 11:31 AM   #4 (permalink)
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Check the weep hole on the bottom of the water pump, if you had a bearing sieze up or drag, it could push the coolant out from there. Either way, it's just good mechanicing to change the water pump anyway. And they usuanlly aren't expensive, either. About a hundred bucks, I'ld imagine.

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Old 01-02-2006, 03:08 PM   #5 (permalink)
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No, not THAT expensive. about $50.
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Old 01-04-2006, 10:37 PM   #6 (permalink)
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There is a coolant ring on the throttle body that heats up the air from the valve cover vent, Check the hose and the ring, but don't remove the ring cover! It breaks easily and the gasket isn't going to be at the local parts house. I have seen many leaks from here in colder areas where salt is used on the roads.

Last edited by Starmavin; 01-04-2006 at 10:39 PM.
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