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Stock configuration is that either the coolant temperature switch or the refrigerant temperature switch can trigger the fans to come on. Seems there are issues with the refrigerant temperature switch working well. Its better if the fan is always on with AC - if the temperature switch is working properly it won't be off much of the time anyway...
Its impossible to test the refrigerant temp switch without a working AC and even with a working AC its a very indirect and ambiguous test - if you have dual system pressure meters on the AC low/high you could tell - otherwise it's a best guess.
Alan
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1994 928 GTS Black/Black Manual
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