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Re: Changing Radiator - 91 750il (archive)
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Posted by Ekkehart Rackete, Bochum, Germany on July 22, 2001 at 05:30:07:

In Reply to: Changing Radiator - 91 750il posted by William on July 22, 2001 at 02:36:59:

1. Systems has to be bled, check archive for details regarding the installed water pump

2. To my knowledge the cooling capacity of the 91 750 iL is 13l= a little over 13quarts. Ratio is 50/50.

Quote from the manual: No additives besides the recommended / approved anitifreese/corrosion protection necessary. Use only anitfrezze free of amino and nitrite containing additives. Check with dealer.

The exact ratio between antifreeze and water is very important below 50% cooling will be reduced above 50% antifreeze the mixture will freeze above -38F°.

I would rinse the system thoroughly with tap water, add 6.5 quarts of antifreeze top with tap water and bleed.

BTW cant think any additive can reduce temperature by 20 degrees. If system is functioning the thermostat together with the fan clutch and aux fan will keep verything at required temperature. 20°F lower operating temps would have a negative effect on a couple of things, from wear to fuel consumption etc. Regards Ekkehart

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