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I would look at fan activity.... (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by Lars on April 20, 2001 at 16:45:59:

In Reply to: 84 733i overheat posted by karam on April 20, 2001 at 16:38:15:

You either have a fan clutch out, or an auxiliary fan not coming on. If you can resolve the problem by pulling air through the heater core, which represents more fan activity, that's the first place to start. If you run at halfway normally, you may want to check the radiator for obstruction, either externally through the core. Backwash it (spray through the backside, forward) to clean out any bugs, etc. and consider having it checked out by a radiator shop for internal flow. would require removal of radiator to do this properly.

My problem was an improperly adjusted auziliary fan, not coming on at the right temperature.

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