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Hello,
My first time here, Great site by the way. I have a 1995 Honda Accord lately I have had to jump the car because it was dead in the morning. I noticed this morning that the car was making a constant buzzing sound while the car has been off. I followed it to the fuse box under the hood and noticed that when I remove the cooling fan fuse the cooling fan relay stops buzzing. It seems when they are both connected the cooling fan relay begins to buzz. Any idea what might be causing this? Should I replace the fuse and the cooling fan relay or can there be something else happening?Thanks in advance for your help.
Sam
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Is your cooling fan meant to operate with the engine off? If so, I’d think the fan is operating continuously when the car is parked, which is draining your battery. (It’s as if the ECU is being told the engine is always too hot, even though it isn’t.) The buzzing sound is the relay contacts flickering because they are receiving too low of a voltage to operate positively, which is normal once the battery has been drained below a certain point.
As to why your cooling fan is not shutting off, I’m sure someone else who is familiar with Hondas can give you a much better answer than I could. By the way, how does your temperature gauge read? Does it read high all the time, or does it seem to operate normally?
Hello,
Thanks for your reply. The temperature gauge reads normal while driving for long periods of time. It’s not overheating while driving. I just noticed sometimes the fan takes a long time to shut off when the car is off or I have seen it just start running again even after the car has been off for a long time. I’m not sure if a fuse is bad or the cooling fan relay needs to be replaced. I’m thinking of replacing them anyway to see what happens.
Thanks
SteveSince you say you hear the fan operating normally, I would look at the fan switch. I am not sure where yours would be but I think it is at the thermostat housing. when you hear it clicking or running when it is not suppose to be, like when the car is off, then disconnect the plug to the fan switch. Now if it shuts off I would suspect the switch. I would also give that wire a good look to make sure you do not have a short to ground.
Check out the radiator fan switch mounted on your thermostat, it monitors coolant temps in the block and tells the coolant fans wether to turn on or not.
Normal operation though includes the fans coming and staying on for around 2 minutes and then shutting off and maybe turning back on for a minute a few minutes later. This is because of thermodynamic expansion.
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