Radiator fan turns on randomly kills battery NEED HELP!
I have a 95 accord ex and for about the past 6 months the radiator fan to the left turns on at night or when the weather is cool. this kills my battery. me and my step dad have checked all 3 sensors the run to the fan and all of them work. the fuse that runs part of the cooling system works, and i have take this fuse out everyday when im home so the fan doesnt turn on. the only thing that we could come to believe is that there is a short in the wiring. we think this cuz the fan only turns on when its cool outside. my hayes honda accord book doesnt have this part of the wiring system. SOMEONE PLEASE HELP ME!
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Thanks for choosing FixYa and welcome to the site. The fans should come on as soon as you turn the a/c on. There shouldn't be any delay. You could have a bad water pump, valve, or impeller. A bad head gasket can cause overheating also, but I would look into the pump first. Do the flush first. It may help. If it doesn't, look at the water pump.
SOUND LIKE FAULTY THERMOSTAT.FIRST CHECK TO MAKE SURE YOUR CAR HAS ENOUGH COOLANT IN THE COOLANT SYSTEM.FAST WAY TO TELL YOUR THERMOSTAT BAD.BOTH RADIATOR HOSES SUPPOSE TO BE VERY HOT.IF NOT THERMOSTAT STUCK CLOSED NOT ALLOWING COOLANT TO CIRCULATE FROM ENGINE TO THE RADIATOR.IF THERMOSTAT IS FAULTY.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.
Is your Civic air-conditioned (have two fans: radiator(on the left, facing the car) and condenser (on the right, facing the car)?
Does your radiator fan run at all, when the car gets hot?
Have you checked your radiator fan relay in your underhood fuse box (far upper left, facing the car, locations on cover)?
Have you investigated the thermostat?
Leave a comment in answer and I will try to help you
Did you replace the fan? How about the fan switch?
Here is some stuff to read about this system....please let me know what's up!
This switch is the primary controller of the operation of the radiator fan(s) used for cooling. When the coolant in the system reaches a pre-determined temperature, the fan switch closes and completes a circuit. The fans will be brought on. Generally, the switch communicates with the fan relay, although the later PGM-FI cars send the signal through one of the many solid-state controllers first. Do not assume that the switch is the only component in the radiator fan circuit which controls its operation. There are many other components whose failure may prevent the radiator fan from operating. If the fans are not working when the engine is very warm, check the fuses first.
On all vehicles except 1990-95 Accords and 1992-95 Preludes, the fan switch is located in the bottom of the radiator. On 1990-95 Accords (except V-6) and 1992-95 Preludes, the switch is located in the housing at the rear end of the coolant connecting pipe. This is the pipe running along the outside of the engine, just above the oil filter. The switch the only electrical component in the housing. On the Accord V-6, it threaded into the side of the coolant crossover pipe (not next to the bleed bolt) on the transaxle side of the engine.
Usually on most vehicles the coolant temperature sensor sends info to the ecm which then determines when to turn your fan on and off, when you turn the car off the fan may continue to run until the engine reaches a cooler temperature, if the front radiator grill is'nt getting proper air flow to cool the coolant down check the radiator grill for damage or debris build up, if the car has problems over heating check the entire cooling system.