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I'm not sure if this model has the Rex-Regina injection system, but my 1990 740 has similar problems and it turned out to be the Radio Supression Relay. You may or may not have one in your car. But if you do, you have two of them and one controls the fan. So you can switch the relays as a test. Just a thought.
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Six Volvos: all wagons.... 1972 145S, 1976 245 DL, 1983 245 GL, 1986 740 GLE, 1990 740 GL, now a 1995 940. Number 7 (a 1967 122S Wagon) is on the way.... Who needs a sedan, when you've got storage compartments in a wagon?
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