overheating 1966 230sl - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 07-14-2008, 09:56 AM Thread Starter
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overheating 1966 230sl


I have a 66 230 sl that is in great condition but recently it is overheating only while being driven at higher speeds on freeway. I live in Arizona so it's hot but I have driven it in summertime for last 4 years with no problems. It doesn't overheat while idling or driving around town. I have put in a new radiator and thermostat with no improvement. The mechanic also reset the timimg on it, which helped a little bit. I would love to have any suggetions or thoughts. Thanks. Jim

Last edited by jrrx@cox.net; 07-14-2008 at 04:00 PM.
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post #2 of 3 (permalink) Old 07-14-2008, 11:23 AM
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Some recommend installation of an aux electric water pump from a W123 or 126 or other later model Mercedes.

Pagoda SL Forums - Overheating Solution?
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post #3 of 3 (permalink) Old 07-14-2008, 03:03 PM
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If you can rule out a lean condition with fuel and ignition systems, check the fan clutch. If it doesn't turn freely at high revolutions the airflow may be disrupted resulting in overheating.
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