Only hearing one fan come on only while car is shut off
You can take a look under the hood at the fuse and relay box. the fan relays are probably just old and worn out and need replacing. try this and also try and follow the wire back to the relay box to make sure its connected. If this doesn't work, you can always run a power wire straight to the fan so when you turn the key it comes on and stays on. It should just be a bad relay. good luck
SOURCE: What fuse # controls the in cabin fans on a 2004 Honda CRV?
The fuse box is located under the steering wheel to the right. A diagram on the back of the removable door should show you which fuse to check. You will likely need a pair of needle nose pliers to reach/pull the the fuses, they're recessed beyond the opening.
SOURCE: 1996 honda
you know the fans are ok most honda have a two terminal switch at the right corner bottom of tthe radiator if you put a jumper across this terminal the fans should kick in, this indicates that the coolant temp sensor is bad replace it, secondly some honda have a temp sensor located right on the thermostat housing and you can disconnect the wire and just ground the wire and the fan should come on so replace the temp switch last thing to check for is coolant leak around the readiator seem i mean the edges the radiator being fiber glass may have hair crack through which antifreeZe keeps leaking out the only suggestion for honda is to replace the radiator.
SOURCE: how to remove the radiator of a 1986 honda civic
yes you need to take the fans off ext till the radiator is ready to come out shouldnt take more than a half hour
SOURCE: 93 honda accord keeps getting really hot and fans won't turn on
fan relay or coolant temperature sensor
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