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Old 17 Mar 2011, 02:46 am
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Default 1994 Civic EX cooling fan problem?

Ok so I have a cooling fan that will not operate when he car reaches temp. I have replaced the fan switch, ( the one in the thermostat housing) the thermostat and have done a complete radiator flush. Now i have heard the fan switch can go bad, so i took off the connection and bridged it with a wire and the fan works... I also switched around all of the relays in the fuse box (the heater motor, defrost and cooling fan) and they all work... I also test the new and old fan switch by dipping it in boiling water and the connection closes on both (so the old one is still good). So the relay, fan switch, fan motor and wiring are all good... WTF is the prob.
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Old 17 Mar 2011, 03:01 am
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Join Date: Jan 2011
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Sounds like the coolant isn't telling the switch the temp. you mlst likely have an air pocket at the sensor causing it to not know the temp. Is the thermostat opening? When it's running hot, is the lower hose cold near the thermostat? If so replace the thermostat with an OE unit and gasket. Don't use aftermarket. They don't open properly.
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Old 17 Mar 2011, 03:16 am
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CEL on?

All the fan circuit has is a relay, fuse, fan motor, ground, and switch. If all the components are good that just leaves a wiring problem. Make sure everything is receiving power and there are no wire breaks.


1. Check both fuses #33 and #13

2. If both look good, turn the ignition switch to position II. Both fuses should have a 12v power supply available on both sides. If either one is not getting 12v, trace the wires running to the problem fuse backwards and look for any damage.

3. Make sure the wires from the fuses to the relay are good. With the ignition switch in position II, the black/yellow wire at the relay should have 12v and the all red wire should have 12v. If there's no voltage in 1 or the other trace them back and look for damage.

4. Find the coolant temperature switch, with the ignition key in position II check for a power supply going to the switch (green wire). If it's not getting power, follow the wire back to the relay and check for damage. There is a connection point between that green wire off the switch and a yellow/green wire that comes from the relay, it's possible this connection may be bad.

5. If power is good at the switch, check the switch ground. Make sure it's secure and clean and there's no breaks in the ground wire.

Your problem is most likely in the wiring between the relay and ground for the temperature switch or in the yellow and black/yellow wiring running to and from fuse #13.

If all else fails you could wire in a new circuit to the fan for a toggle switch and just manually turn it on/off. It's not uncommon to do.
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