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Radiator Fan will NOT turn off, even when car has been off for hours 200 1991

posted by  Volvodad on  Sat Jun 26 08:42 CST 2004
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

From Colin's tip, it sounds like Volvo changed the fan wiring on later 240's. My 83 manuals show the relay output powers the fan through the temp sensor switch. The relay is "on" whenever the ignition switch is on. So even a stuck relay would not keep the fan running unless the temp sensor was also stuck closed.

That's not good design, and perhaps Volvo got smart and changed things to use the temp sensor to trigger the relay. Then either a stuck sensor OR a stuck relay would give the described problem. It then follows that if disconnecting the sensor doesn't stop the fan it has to be a stuck relay, which is an easy and cheap fix.
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, "my" 94-944 B230FD; plus wifemobile Dodge minivan, hobbycar MGB, and numerous old motorcycles)






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