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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 09-20-2010, 03:44 PM   #1 (permalink)
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Overheating 1984 318i

I have an overheating problem the gauge needle reaches the third line. The fan clutch is new, I eliminated the thermostat, I took the radiator to get fix because it was clogged and obviously changed the engine coolant. But I keep thinking why the car overheats and the engine fan clutch doesn't goes hard. The electric fan works both speeds but the fast speed switches on it doesn't come off meaning that the coolant is not cooling. Can anyone help ?
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Old 09-20-2010, 03:54 PM   #2 (permalink)
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Did you bleed the coolant system after you replaced the radiator & coolant.........



coolant system bleeding trouble. - Bimmerforums - The Ultimate BMW Forum


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Old 09-20-2010, 04:23 PM   #3 (permalink)
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The 84 318i doesn't have the bleeding screw in the thermostat housing.
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Old 09-20-2010, 04:42 PM   #4 (permalink)
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Originally Posted by Kid_318i View Post
The 84 318i doesn't have the bleeding screw in the thermostat housing.
Then it should be self-bleeding..........when does it overheat? @ idle, driving or both........



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Old 09-20-2010, 04:56 PM   #5 (permalink)
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Both, this is driving me nuts
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Old 09-20-2010, 05:15 PM   #6 (permalink)
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Originally Posted by Kid_318i View Post
Both, this is driving me nuts
Sometimes removing the t-stat is not a fix.....I agree, if the flow is too fast, coolant might not cool.......


Can thermostat elimination cause overheating? - evolutionm.net

also.....with the radiator cap loose & the heater on high.....I would try squeezing the upper & lower radiator hoses......maybe there are some air pockets.........


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Old 09-22-2010, 06:01 AM   #7 (permalink)
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Water Pump?
Sometimes the fins just rust away until there is hardly any water movement.
You'll see flow, but it's not [I]enough[I] flow
I know this from experience... "I'm in Florida, I don't need anti-FREEZE!"
Well, there are rust inhibitors in the coolant, and corrosion may be the culprit.
Someone, alone the way might have let the antifreeze go too long.
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