Cooling fan not coming on

Tiny
DALICH
  • MEMBER
  • 1995 BUICK CENTURY
I have recently replaced the ECM thinking it is bad b/c the cooling fan and AC fan are not coming on. Even when turning on the AC, no fans or compressor. The new ECM made no difference.

The relays and fans are fine. I believe that the cooling fan relay "should" have a hot link to the relay and the ECM then grouns the other side causing the relay to close. I did not have the "hot" side on the relay and when I cut and jumped this wire to Hot, the cooling fan will turn on and off with engine temp.

Is there a fusible link in the wiring harness that supplies the hot side to the cooling fan relay? If so, where is it and what are the wire colors? I was told to look for a real along side the steering column but cannot find anything inside the passenger compartment.

In summary, ac compressor, fan and cooling fan not working. Fuses in fuse block are fine. No hot wire to cooling fan relay. Is there a fuse somewhere inline?
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Thursday, November 11th, 2010 AT 9:29 AM

13 Replies

Tiny
JDL
  • EXPERT
Here is the fan wiring diagrams and the relay location and a guide to help you test the relay.

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

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

Cheers
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Thursday, November 11th, 2010 AT 9:57 AM
Tiny
DALICH
  • MEMBER
Okay, judging by the wiring diagram it is looking like the 10A in-line fuse (behind the right side of dash near upper left rear of glovebox). The fuse center is located in the glovebox. I removed the glovebox where I can see all the way back to the firewall. I cannot find this inline fuse. There are a bunch of pink wires, but I cannot find this inline fuse. It is a 1995 Buick Century 4 cylinder 2.2L

I have a very good view, I just do not see this inline fuse.

Never mind. Just found it. 3 fused links were taped together out of sight. Felt like a plug but when unwrapped I found the fuses. 10A, pink wires, blown. All fixed! Thanks I love this site.

Thanks,
Dan
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Thursday, November 11th, 2010 AT 10:48 AM
Tiny
JDL
  • EXPERT
Nice work, we are here to help, please use 2CarPros anytime.

Cheers
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Thursday, November 11th, 2010 AT 11:10 AM
Tiny
BOUTGVNUP
  • MEMBER
  • 1995 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 101,756 MILES
The fan motor works by hot wire. I have changed the relay, engine temp switch, checked fuses all good and even swapped out the computer.I have also checked all fusable links coming off the starter. I cannot find any broken wires. What have I missed?
If you can solve this I will gladly donate for future questions. I have a dooseey yet to come
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
LOUT5369
  • MEMBER
You say you replaced the temp switch, you must know what you're doing. Check if vehicle calls for a fan switch, it'll be Black with 2 wires near the Thermostat housing. Good luck, Lou
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
MLW0351
  • MEMBER
  • 1991 BUICK CENTURY
Engine Cooling problem
1991 Buick Century 6 cyl Front Wheel Drive Automatic

replaced coolant temp sensor, no engine codes present can still move fan by hand, is it possible the fan motor is bad or fan relay
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
First check fuses, if OK check cooling fan relay located on relay bracket at right front corner of engine compartment. If both OK then supply 12v direct power to fan. If still doesn't run the motor is shot.
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
CHASENDRAKE
  • MEMBER
  • 1994 BUICK CENTURY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I am trying to figure out why the cooling fans do not work and the car overheats, there are 2 fans on the radiator ands niether work, I replaced one fan motor and the thermostat seams to be working but the fans won't come on when engine gets warm, can you help with this problem? Thx
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
LEGITIMATE007
  • EXPERT
Is there an engine light on, does the fan come on when you turn the a/c on or turn the defroster on?
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
CHASENDRAKE
  • MEMBER
There is no light on and when I turn the air conditioner on, no fan works, the guy at the auto parts store said it may be the relay or the fuse under the hood but I do not know where these are located if you could help with the location of these items and if you think this is the problem please let me know thx
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
DR. HAGERTY
  • MEMBER
The relays are behind the right headlight and the fuse box is in the glove box.
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Friday, November 9th, 2018 AT 12:50 PM (Merged)
Tiny
HYDRO605
  • MEMBER
  • 1997 BUICK CENTURY
Electrical problem
1997 Buick Century V6 Front Wheel Drive Automatic 93000 miles

1997 Buick Century 93000. 3.1 V6 Radiator fans do not work. I have replaced all 3 relays, as well as the coolant temperature sensor. The fans do come on when connected to direct power as well as coming on when the a/c is is turned on, but they only operate at a low speed with the a/c. Any ideas?
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Friday, November 9th, 2018 AT 12:51 PM (Merged)
Tiny
KEN
  • ADMIN
You have two main power fuses, 30 and 40 amp in the main fuse panel, check these first, then check for power/ground at the relay, if all checks out you will need to check the electrical wires step by step with a wiring diagram.

https://www.2carpros.com/articles/how-to-check-wiring
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Friday, November 9th, 2018 AT 12:51 PM (Merged)

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