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Cooling fans not working

Tiny
$ANGEL559
  • MEMBER
  • 2003 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 170 MILES
I need help with my car listed above SI model. I’ve changed the coolant switch and fan relays are but fans still don’t turn on and even while turning ima still no fans turn on?
Monday, July 6th, 2020 AT 7:23 PM

57 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a wiring diagram for you to view.

We need to do some testing to find out why the fans do not work

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Does the condenser fan work with the A/C on?

Roy
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Tuesday, July 7th, 2020 AT 5:13 AM
Tiny
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It blows out air inside car it fans don’t turn on when I turn on A/C.
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Tuesday, July 7th, 2020 AT 10:08 AM
Tiny
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Okay, that fan will come on when the high side pressure hits 150 pounds.

Do you have a tester for doing some voltage checks?

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

Roy
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Tuesday, July 7th, 2020 AT 10:26 AM
Tiny
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No, but I’ve changed the switch because I thought it would be that but nothing still. Still no fans when temperature gauge is at its heat they still don’t turn on even if I try to turn on A/C. I know they should kick on anyways when turning on A/C but nothing.
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Tuesday, July 7th, 2020 AT 1:47 PM
Tiny
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Can you go to the radiator fan relay and check for voltage at the relay with the key on?

In the diagram I sent you, there are 2 fuses for the relay.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy
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Tuesday, July 7th, 2020 AT 1:51 PM
Tiny
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I do not know if every little whole on relay that the relay for fan to turn on have to have voltage but the small fuses have voltage.
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Tuesday, July 7th, 2020 AT 1:56 PM
Tiny
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I attached the location of the relay for you.

Roy
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Tuesday, July 7th, 2020 AT 2:52 PM
Tiny
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No, I do not know that, but does every little whole that the fuse hose into have to have voltage?
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Tuesday, July 7th, 2020 AT 3:01 PM
Tiny
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No, with the key on, you should have 2 terminals with voltage.

Roy
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Tuesday, July 7th, 2020 AT 3:11 PM
Tiny
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Oh, okay. Yea there’s power going through there.
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Tuesday, July 7th, 2020 AT 3:17 PM
Tiny
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How many powers? Please give me as much information as you can.

Roy
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Tuesday, July 7th, 2020 AT 3:42 PM
Tiny
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  • 33 POSTS
11.58 and I’m giving you everything. I’ve been trying to be honest it’s crazy how it don’t turn on would a bad thermostat not make the coolant can’t to turn on? But okay either way when turn on A/C they both suppose to go on?
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Tuesday, July 7th, 2020 AT 3:46 PM
Tiny
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Okay, is that one terminal or 2?

11.58 means your battery is dead. You should charge your battery. It needs to be 12.6 volts.

Roy
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Tuesday, July 7th, 2020 AT 3:47 PM
Tiny
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But even though the car turns on?
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Tuesday, July 7th, 2020 AT 7:09 PM
Tiny
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Yes, the voltage you need to these terminals needs to be above 12 volts for the relay to work.

Again, how many terminals have voltage at the relay?

Roy
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Wednesday, July 8th, 2020 AT 3:26 AM
Tiny
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Both have 12v I just checked it. But do you think a bad thermostat would effect it if it has a bad one?
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Wednesday, July 8th, 2020 AT 1:50 PM
Tiny
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Okay, if the thermostat is wide open and the coolant never reaches 208 degrees, yes it could.

One test you could try is to disconnect the connector for the coolant sensor with the key on. The fans should kick on.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

If they do, the all the electric is good and the issue is it is running too cool.

If it does not, then we have an electrical issue.

Try that and let me know.

Roy
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Wednesday, July 8th, 2020 AT 2:05 PM
Tiny
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They don’t turn on still.
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Wednesday, July 8th, 2020 AT 4:45 PM
Tiny
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I unplugged the connection and nothing.
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Wednesday, July 8th, 2020 AT 4:45 PM
Tiny
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Okay, with the sensor unplugged, check for power to the fans. Use your test light or voltmeter and see if there is any power to the plugs.

Roy
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Wednesday, July 8th, 2020 AT 4:53 PM

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