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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 06-15-2005, 06:18 PM   #1 (permalink)
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I have a 1987 E30 318i and it is having an overheating problem. When i drive the car the temp is fine but when i am stationary the temp starts to rise slowly. Recently the temp has risen to near "RED" level and this has worried me. I thought i had an air lock in my engine so i bleeded the water and started from scratch. The heaters work fine and blow both hot and cold air. Its only when i am stationary that i experience this problem. Any ideas of what this could be?

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Old 06-15-2005, 06:28 PM   #2 (permalink)
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Sounds to me like your viscous fan clutch (that device on the front of your fan on the engine) has failed. You have two fans, a viscous on the engine and an electric in front of the radiator. If you are overheating in traffic or in slow driving, but OK at speed I wopuld change the fan clutch. This is not a expenive item and you can do it yourself.
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Old 06-16-2005, 09:37 AM   #3 (permalink)
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Ok thanks. Where is the Viscous fan clutch located?
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Old 06-16-2005, 10:39 AM   #4 (permalink)
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The fan clutch is attached to the mechanical fan.
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Old 06-16-2005, 06:30 PM   #5 (permalink)
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Remove your fan that is attached to water pump pulley and that finned aluminum piece that is screwed on to the fan is the clutch. On my E32 it was held on by four allen head screws, I removed screws, clutch fell away, put new clutch in place, screwed her down, replaced fan, and no more overheating.
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Old 06-20-2005, 06:48 PM   #6 (permalink)
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I would also check the thermostate when they go bad they stick open and the coolant doesn't have a chance to cool down
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Old 06-22-2005, 01:49 PM   #7 (permalink)
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Originally posted by crazy91318@Jun 20 2005, 03:48 PM
I would also check the thermostate when they go bad they stick open and the coolant doesn't have a chance to cool down
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its been my experience that its the opposite.. they stick closed and coolant never reaches the radiator. if it sticks open then the car cools down TOO much at highway speeds and shouldnt generally overheat at any speed.

ive run cars with no thermostat before and never had a single one overheat, they just over-cool at speed.
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