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i have an electric fan on my 145 and 245. they work great, and are quieter.
there are several things to consider.
1- mounting and size
there is not much room between the pullys and the radiator. the fan would have to be very thin to fit between, as a puller. less than 2.5". on my car i mounted the fan as a pusher. a 16" fan will not fit in front, but a 14" will. i live in the dc area so the cars see alot of heat and stop and go trafic. i never have overheating issues. it even runs cooler on the highway. guess there is less turbulance when the fan is off so more air is forced thru.
2- on/off switch
i have tried several switches. from a simplely wiring it thru the ignition via a relay so its on when the car is on. it kinda defeats the purpose of having an electric fan, the best part about having one is that there only one when they need to be. there are several thermo-switchs i've tried. the first had a set temp that it turned on at. it had a hokie thing you stick between the fins of the radiator or in the radiator hose. it was set at too high of a temp. so i tried an adjustable one. it would turn on and off when it was saposed to and had several other features like auxilery switches so you could put an overide switch on the dash or make it turn on with the ac. but it to had the hokie thing that went into the radiator. so i got a thermo-switch housing that goes in the lower radiator hose on 240s with ac or in some saabs. i wired it up with a dual (87) outlet relay . one goes to the fan the other goes to a light on the dash to tell me that its on. the reason for the dual 87 is that if you wire the light to the same out as the fan. when the fan is off and it is spining on the highway the fan acts as a generator and will make the light glow. so keeping them isolated will keep that from happening. i also wired in a overide switch.
3- power draw on the electrical system
i have a stock altanator on my car and haven't seen any adverse afects.
well best of luck
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