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940 Fan Circuit? 900

uid 18083's pic
posted by  lucid on  Fri Jun 10 10:05 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

You don't give the car's year, but on my '93 940, the fan does not run continuously. It has a Low and a High speed, both intermittant.

Low speed is controlled by a pressure sensor on the AC condensor. The cycling interval probably varies with temperature, state of AC system charge, etc.

High speed operation can be started by either the thermo-switch on the right side radiator tank, or by a second (higher pressure) sensor on the condensor. These also cause the fan to cycle, turning it off when the temp or pressure drops a specified amount below turn-on level.


--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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