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Old 10 Dec 2012, 10:46 pm
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Default Honda civic, AC and heater not working?

2002 Honda Civic. I'm getting no fan with heater, or AC. I checked all under hood and under dash fuses, but all are good. I removed the fan motor and hot wired it to a 12-volt transformer and it runs fine. Is there a relay or something I'm missing? Is there a way to test relays? Maybe the fan motor switch is bad? Anything else I can check? Thanks in advance for any help.
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Old 10 Dec 2012, 11:02 pm
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Join Date: Mar 2008
Posts: 343

Double check the 80amp fuse under the hood , that fuse number on the chart is no19, then check fuse no20, it will be a 40amp fuse.If fuse no 19 is okay, pop out fuse no12 it will be a 40amp fuse.Now take a 12 volt automotive test probe, ground it's negative clamped wire to the negative on battery.Then take the test probe's tip and check for power at the fuse no12 socket connections.One of the sockets connections should be lighting up the probe and if not double check test probe by connecting it's tip to the battery positive post.If no power is found at either of the fuse socket connectors at fuse 12 then fuse 19 the 80amp fuse maybe blown or the circuit has a bad or fried/melted connection.Note if power is at fuse socket no12 , pop fuse no12 back in and pop out 20amp fuse no1 see if any power is at it's socket, then try 20amp fuse no4.In other words with the 80amp fuse in and fuses no1,no4, no12, no20 out each fuse socket should all have power on one it fuse connectors.This means with all the fuses in place there should be power at both of the fuse legs.pins or sides.

If all those fuses feeds and circuits are okay, turn the ignition to the run position, pop out the 10amp fuse no14 and see if one of it's sockets connectors has power.Note if no power is found at the socket then the ignition may have a problem bec the ignition no2 circuit feeds fuse no14 and the ignition gets it feed from a white wire coming from fuse no20.

The blower motor also has a relay in its circuit this relay gets two 12 volts feeds , plus it has a transistor in the circuit so a fuse , ignition, or the blower motor switch or relay or the transistor etc can be causing the problem.

Hope that helps and best of luck.By the way I looked at an actual 2002-2003 Honda Civic factory service manual and basically gave you the main fuses etc in that circuit.If you need the schematic/diagram or trouble shooting info it has msg me and I'll send you the info and try to help or guide you further.
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