Question about 1999 Honda Civic

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My cooling fan won't turn on (both). Checked the fuses and they look good

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  • jason pletcher Mar 17, 2011

    Is the vehicle over heating? When you turn on your a/c does the fan(s) start? May take a couple minutes.

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The only way to be sure the fuses are good is to test them, the other problems may be the relays, sensors or the fan motors are bad. You may have had a problem with one not working for a while and not noticed until the other also went down. One of them is the main cooling fan, the other kicks in when the A/C system is activated [ this will be on when the deforster is on ], try to see if one of them works when A/C is switched on. Using a scanner that will access that system would help you find the cause, other then that you would have to manualy test starting at the fan motors and work back thru the system.

Posted on Mar 17, 2011

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This is controlled by a cooling fan sensor/temperature sensor, as well as fuses, and a relay. These will have to be checked.

Make sure your coolant level is full, the coolant temperature switch won't work if the level is too low. If coolant is low, you need to find out where it went to by pressure testing the cooling system.

If it's not low and the fuses are good, the relay is working:

The fan should be tested, bypassing any sensors to make sure it is functioning properly.

The sensors can be tested to be sure they are working properly at the correct temperature with a voltmeter/ohm meter.

Reverse troubleshooting the wiring and ignition is the next step if you haven't found the problem.

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