Radiator fan always on?

Tiny
LISTER89
  • MEMBER
  • 2004 HYUNDAI SONATA
  • V6
  • 2WD
  • AUTOMATIC
  • 217,000 MILES
My radiator fan is on constantly. To the point where the bushings are now worn out and it is really loud. I tried unplugging the relays, but it keeps going. Any ideas? I know I'm going to have to replace the fan but it's just going to happen again if it is constant like this.
Sunday, April 2nd, 2023 AT 3:11 AM

5 Replies

Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Good morning, LISTER89,

My information is telling me your vehicle is equipped with 2 fans.

Do both fans run or just one? If it is just one, is it the driver's side or passenger side fan?

Also, what does the temperature gauge look like when fully warmed up and the fan(s) running? Does it look normal?

Any other issues lately?

Thank you,
Brendon
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Sunday, April 2nd, 2023 AT 5:28 AM
Tiny
LISTER89
  • MEMBER
  • 14 POSTS
Only the driver's side fan is ever on. And the temperature is just under half. Other than needing a tune up, no issues.
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Sunday, April 2nd, 2023 AT 6:06 AM
Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Hello LISTER89,

I am including a diagram of the under-hood fuse and relay panel and have highlighted the radiator fan relays. Are these the relays you removed?

Thank you,
Brendon
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Sunday, April 2nd, 2023 AT 6:55 AM
Tiny
LISTER89
  • MEMBER
  • 14 POSTS
Didn't see the top one before. I started by removing the top one, then the bottom left. When I removed the bottom right, it turned off. So, I plugged back in the top one and the bottom left only. And it stayed off. Only when I plug in the bottom right one again does it turn back on immediately. Does this mean it's a bad relay?
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Sunday, April 2nd, 2023 AT 8:13 PM
Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Good morning, LISTER89,

It sounds that way to me but let's verify just to make sure. Take the bottom left and put it in the bottom right position and see if the fans stay off. They should be the same relay and should have the same part number stamped on it.

If the fan stays off, then it's the relay.

Let me know what happens.

Thank you,
Brendon
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Monday, April 3rd, 2023 AT 3:52 AM

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