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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 05-30-2005, 10:52 PM   #1 (permalink)
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Does anyone know if there is a DIY site on changing the coolant? My coolant light came on and I need to refill coolant. What should I use for coolant for a 1990 325is coupe, BMW coolant or aftermarket?
Anyone?
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Old 05-31-2005, 03:50 PM   #2 (permalink)
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Depends on what you have in there now... don't mix types!

You should first find out why your system is leaking coolant.

WHEN YOUR CAR IS STONE COLD, top up to the cold max level on your expansion tank with the same fluid that is in there. Green is standard antifreeze, blue is BMW Coolant. If you see blue, be sure you aren't looking at your windshield washer reservoir

Watch/check for leaks once you get the car up to hot. Check for drips underneath, and look for tattletale drip marks and residue on the higher hoses, where the coolant may have steamed out and dried up.

Also, while you are under the hood, check your oil, and make sure its not like a chocolate shake. That would be a bad sign.
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Old 05-31-2005, 03:53 PM   #3 (permalink)
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Oh, and if you change out the coolant, be sure to drain both the rad and the block.

There is a good article on bmwe30.net about flushing your cooling system.

Refill with BMW Coolant mixed with distilled water ONLY!!!
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