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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 07-10-2007, 06:11 PM   #1 (permalink)
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overheating at idle

91 318is

The car has 240k and I just replaced the cracked radiator and new thermostat. The fan clutch is fine and the high heat hose is fine. It doesn't leak any coolant and none of my hoses are cracked or worn. It keeps a decent temperature while the rpms are kicked up but at lower rpms or at idle, it immediately begins to overheat. I'm thinking water pump but has anyone heard of those impellars getting worn to the point where they slip like that. Is there some kind of in-line pressure release valve orsomething i should be looking for? Don't wanna replace the waterpump if I don't have to.

Thanks.
Mike
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Old 07-10-2007, 07:04 PM   #2 (permalink)
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Make sure you bleed it. Also make sure you installed the thermostat the right way with the spring inside the motor.
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Old 07-13-2007, 06:19 PM   #3 (permalink)
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when you say to "bleed it," do you mean to let the car run for a while with the resevoir cap off to get any air out of the system?
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Old 07-13-2007, 10:48 PM   #4 (permalink)
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No, open the bleed screw. It should be next to the radiator cap if you have the black plastic tank.
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