1993 Honda Civic Cooling Fan does not come on

Tiny
STRAIGHTROADTOSUCCESS
  • MEMBER
  • 1993 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 272,078 MILES
Hello!
My 1993 Honda Civic keeps overheating. I have scoured the internet to find the solution but have always come up with the same basic answers. Relay in the underhood fusebox (fine), cooling switch on the thermostat housing (fine), thermostat (for overheating, but still fine), fan motor (fine).

I believe it may be a wiring problem but it seems unlikely. How do I jump the switch to the fan motor? If you can jump it from there, why is there a relay at all? I will rewire the relay and switch if necessary, but they join with 50 or more wires and don't want to take the chance of using the wrong wire.

I wired a rocker switch to turn my fan on but since my finger is not a temperature switch, there is no guarantee of correct timing of the fan. This is not a head gasket/core plug problem. I do not have AC.

This is definitely some sort of electrical problem. Usually, wires don't just "go dead". I do all of the work on my car myself, and will have no problem understanding (though maybe through more research) very advanced technical information. What can I do here? If I wire the fan directly to the switch on the thermometer housing, will it run all the time? Will it have a problem considering that the relay will be unused? Or is the relay used as the power supply for the switch? Or is the relay "a delay mechanism"?

I have a Haynes manual but the information is limited. I also have a mechanics detailed manual but finding specific information is very difficult and I have no luck.

I don't mind wiring the fan it to the switch or relay, I just don't want to do anything dangerous (electrical fire, damage of electrical parts from bypassing important parts, etc.)

I thank you in advance, information on this particular subject seems nowhere to be found, as they all seem to only go up to relay, switch, motor, thermostat, radiator & cap. For the guys who have done all of that, I hope we all can get an answer to save these people money!

Thank you
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Friday, June 19th, 2009 AT 3:01 AM

3 Replies

Tiny
MILLARDPRATT
  • MEMBER
Having the very same problem with my 1993 Honda
Civic DX. Radiator Fan will not come on, replaced radiator, Thermostat, cooling fan relay, and Radiator thermometer. Pulled the cooling fan replay from the fusebox and straight wired it to it and it came on, so I know the fan is good.
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Sunday, June 21st, 2009 AT 7:19 PM
Tiny
KHLOW2008
  • EXPERT
Hi straightroadtosuccess and millardpratt,

Just some basic understanding before we get to resolving the problem.

The relays are for transfering power from the battery to the fans and the fan switch does not have the capacity for the amount of current to pass through.

Ok to the problem.

To jump the fan switch wire, disconnect if from the switch and use a paper clip or wire to bridge the connection.

Turn ignition swtch to ON and fan should work. If fan does not work, the wiring circuit or relay is at fault.

Let me know what you find and whatever info you need, I will try to get them for you.

I believe we can solve this problem without any modifications.
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Sunday, June 28th, 2009 AT 3:04 PM
Tiny
HEHERSON
  • MEMBER
Ur right mr khlow2008 same problem before with my honda civic esi 94.I replace all mention above but still. Den I decided to replace the radiator with new one. But still the same. You know what?I change the engine oil(castrol) and accedentally solve the problem. Until now its working good. No overheat at all. What an incedent hehehhe.
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Saturday, June 29th, 2013 AT 7:47 AM

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