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My 89 740 has the same set-up..the fan behind the rad is the regular one,the electric one in front only comes on when the car is about to overheat...DO NOT disable this one. It will save your car's aluminum head from heat warping. The temp sensor for overheating is located on the top passenger's side of the radiator. Get yourself a Hayne's Volvo manual (or equivalent) and also read the FAQ section of this brickbard covering the 700 series and save yourself a lot of money and grief. Hasta luego,Genaro.
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