cooling fans wont come on

1996 PONTIAC FIREBIRD
120,000 MILES • V8 • 2WD • AUTOMATIC
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GLETTE 24
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  • 1 POST
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?
Dec 31, 2008 at 12:26 AM
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KEVIN12881
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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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Jan 19, 2009 at 1:05 PM
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MIKEYACE69
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I had this problem and had to fix the melted fuse holder in the fuse panel FYI
Jan 19, 2009 at 1:08 PM
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JEFFERY GUNDERSON
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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.
Jun 10, 2019 at 7:33 AM (Merged)
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Check and test the coolant temperature sensor-if okay could be the computer controlled of the fan relay
Jun 10, 2019 at 7:33 AM (Merged)
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RETAILMAN
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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?
Jun 10, 2019 at 7:33 AM (Merged)
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 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.
Jun 10, 2019 at 7:33 AM (Merged)
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