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Cooling fans wont come on

Tiny
GLETTE 24
  • MEMBER
  • 1996 PONTIAC FIREBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Cooling fans wont come on when engine warms up my understanding is 3 relays in fuse box and one fuse can you tell me where a possible thermostat switch is located or a wiring diagram?
Wednesday, December 31st, 2008 AT 8:26 AM

6 Replies

Tiny
KEVIN12881
  • MEMBER
  • 336 POSTS
Test fans by unplugging electrical connector at the fan motor and use a fused jumper to connect the fan directly to the battery. I can tell you how to check the relays (check continuity between 1 and 4, should be none until power is applied to 5 and ground to 2) the engine coolant temp sensor is connected to the water pump. I would check for power at fuse #7 in the under hood fuse panel here is the cooling fan wiring diagrams so you can see how the system works.

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

Check out the diagrams (Below). Please run this test and get back to us.
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Monday, January 19th, 2009 AT 9:05 PM
Tiny
MIKEYACE69
  • MEMBER
  • 1 POST
I had this problem and had to fix the melted fuse holder in the fuse panel FYI
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Monday, January 19th, 2009 AT 9:08 PM
Tiny
JEFFERY GUNDERSON
  • MEMBER
  • 1 POST
  • 1995 PONTIAC FIREBIRD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
95 Pont Firebird 3.4 V6, cooling fan not coming on when heated up. The fan works, and the relay is good, replaced temp control switch.
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Monday, June 10th, 2019 AT 2:33 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the coolant temperature sensor-if okay could be the computer controlled of the fan relay
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Monday, June 10th, 2019 AT 2:33 PM (Merged)
Tiny
RETAILMAN
  • MEMBER
  • 4 POSTS
  • 1992 PONTIAC FIREBIRD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 133,000 MILES
Hi, my cooling fan ran normally, untill I bought a new ecm, or ecc and now it doesnt run. I just wanted to know if u had any ideas of what it might be?
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Monday, June 10th, 2019 AT 2:33 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Make sure the wiring harness going to the computer is tight. Also, check to make sure the wire to the temp sensor and relay are still attached. Finally, make sure the fan motor is still good. If you run a jumper wire from the battery to the motor, it should run.
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Monday, June 10th, 2019 AT 2:33 PM (Merged)

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