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Re: the cooling fan doesnt work on my 91 honda accord
Cooling fan Relay
Engine temp Sensor
Cooling fan itself
If While A/C is on Fan does not come on I would Check Fan By unplugging it first than apply Pos+ and Neg- to it if it comes on that's eliminated Then go to step 1-3 one of them is bad I usually replace Engine temp sensorsno mater what they are Crucial components for the safety of the Engine.
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The fans will likely come on with the A/C. One is to help cool the radiator when you aren't moving, and the other is for the A/C when there isn't enough airflow to cool the condenser. Both fans may continue to run even after the car is turned off.
There are two fan switches on that car; The main one turns the fan on and off when the ignition is on and the car is running. The second switch powers the fan if the ignition is off and the engine temperature is too high, to cool the engine off if it was just shut down. It sounds like your main fan switch has gone bad and needs to be replaced since it's not sending any signal to the fan, while the engine is running.
If the cooling fans are not coming on when the vehicle is overheating try this.
Look for the coolant temp switch B. it will be located near the thermostat housing on the back side of the passenger side of the engine (follow the lower hose to the engine). It will have a white with green wire and a black wire. Unplug it, turn the key to the run position, the engine does not need to be running. ground the white with green wire. if the fans come on replace the coolant temp switch B sensor.
Sounds like possibly a shorted or sulfated battery to me. I would replace it, especially if it is four years old or mor. Also check all of your battery connections and cables to verify that they are clean and tight (BOTH ends of the cables).