Question about 1997 Honda Civic

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Fan doesnt kick on to motor when motor gets warm its on a honda accord 1997

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  • becky222 Aug 18, 2008

    we changed thermostat and fan to a/c side the fan to motor side does not click on when motor gets warm also checked fuses which are good ..does it have a sensor unit to fan to motor ?



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The most likely cause is that there is air in the cooling system, you will need to bleed out the air from the system, an easy way to do this is to get a floor jack and jack up the front of the car as high as you can get it, fill the radiator and coolant recovery tank until they are full, then run the engine until it is at normal operting temp, shut it down and run a garden hose over the radiator, allow the engine to cool and check the coolant level again, remember the radiator fan does not come on until the engine is at the high end of the operting zone on the temp guage, about 225 deg F.

Posted on Aug 18, 2008

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With the engine key switched to 'ON' BUT not running locate the temperature switch( not to be construed with the engine temp sensor) The temp sensor only signals the temp indicator how high your engine coolant is. the temperature switch is what triggers the fan motor to turn on. With the temp switch identified, pull the electrical plug from it. the fan motor should kick in, which means that the temp switch is defective.
If not it must be the fan that is not turning or stuck. Another way of testing the fan is to apply direct 12 volt on the fan plugs it should turn vigorously( don't be fooled by the fan turning, It maybe turning but not fast enough).

Posted on Nov 08, 2008

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Hehehehe... tapos napo aq sa case na ganyan at e2 share q sa inyo paano q troubleshoot....check d fuse box, remove d fan motor relay and check d socket..mamapansin nyo may sign ng melted makatuwid po maluwag ang socket terminal..pra po magawa yan at mahirap kalagin ang assemby nyan,yong mismo 4 pins socket nya sungkitin ng flat screw driver pra sumikip at maipit uli ang pins ng relay/fuse...e2 po nangyayari dahil sa ndi natin maingat na pag-pull-out ng relay..kylangan po hugutin lang ng diretso pataas at huwag left -ryt ways swing...i just buy my honda civic LXI'97 last week, dami problem, kya d2 rin aq sa site na e2 to find solution pa sa ibang problema.... wlang kasama car manual/handbook...sana pwede po makatulong ang nai-share...until then....RICO!

Posted on Aug 18, 2008

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Hi there,

on a 1997 there are many things that could cause this. The first though is the temperature sensor switch that is usually screwed into the radiator and has a couple of wires that then run to the fan.

In theory the fan motor is engaged when the switch gets hot enough and closes the circuit. If the sensor is faulty though the switch never closes and the fan wont start.
You could check the fan by applying 12 volts across the fan motor terminals and seeing if it spins but its a hazardous job that can hurt your fingers, so the best bet and the first thing to test is the sensor. If you had a mutimeter you can test it by taking out the sensor and checking continuity across the terminals. then sticking the sensor in a jug of boiling water and testing the continuity again after a couple of minutes.

You will however need to find the sensor and be able to remove the old one and replace the new which I think may require draining the radiator a little too and ensuring the radiator is full again after wards. Depends how much of this you want to do yourself.

Please feel free to ask questions.


Posted on Aug 18, 2008

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