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fans not working


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9 replies to this topic

#1 valen

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Posted 03 June 2011 - 07:54 PM

Hey everyone! My fans arent working and its causing an over heating problem! I checked the relay fuses by putting them into the fog light spot. Every time i did so the fog lights worked. They worked with fan #1 relay and with fan # 2 relay and faan #3 relay. Did i check the Relays properly or is there something else i should know?

#2 GaryDoug

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Posted 03 June 2011 - 08:24 PM

Sounds right to me if you are talking about the relays. Did you check the "cooling fan" fuse too?
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1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily

#3 djfirebird93

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Posted 03 June 2011 - 09:59 PM

Definitely start with the Cooling fan fuse. And check the connections at each fan. Test the voltage at each connector. If there's no voltage at either connector, then it's a whole other issue.
My bird is a working progress. New Marshall engine-forged pistons, upgraded rockers and stronger rods/bearings. Rebuilt transmission. New LSD. I wish money grew on trees :)

#4 valen

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Posted 04 June 2011 - 08:09 PM

holy hell! i couldnt find the cooling fan fuse for my life. theres two fuse boxes right? where is that fuse? and what do i have to take apart to get to the connections of the fans?

#5 GaryDoug

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Posted 04 June 2011 - 08:23 PM

Here's a photo of a 98. Might be similar to your car. Note the arrow pointing to the "COOL FAN" legend on the box cover. Not sure about the cables yet.


Posted Image
1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily

#6 Injuneer

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Posted 05 June 2011 - 05:57 AM

The fan motors are fed by a fusible link. The fan relay control voltage is protected by fuse #6 in the underhood box (which is different than the 98 and ups). Here's the diagram for your 95 (use "late production" - the switch from the "early" to "late" design was actually made in the 94 model year, not 95, but they must have forgot to change the wiring diagram).

http://shbox.com/1/1995_pcm6.jpg

Do the fans come on when your A/C is turned on? (Assumes your A/C is charged and working). What temp are you seeing on the dash gauge when you are expecting the fans to come on? Stock programming turns the fans on low speed at 226*F, and to high speed at 235*F.

For future reference, this is the 93-97 underhood box, in the lower right hand corner:

Attached Files


1994 FIREBIRD FORMULA

FRED

Posted Image

381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor 0.78:1 O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

#7 djfirebird93

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Posted 05 June 2011 - 08:57 AM

There should be connectors somewhere on the fans to provide power. I'm honestly not sure where the exact location is on your car, i'm not too familiar with the older models.
My bird is a working progress. New Marshall engine-forged pistons, upgraded rockers and stronger rods/bearings. Rebuilt transmission. New LSD. I wish money grew on trees :)

#8 Gearhead223

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Posted 26 July 2011 - 05:53 PM

Hey injuneer do you have that fan circuit diagram for a 2000 3.8L?

Dj the plugs for the fans are on the bottom of the fan motors.

#9 Injuneer

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Posted 27 July 2011 - 09:25 AM

GaryDoug posted a link to the 99 shop manuals, downloadable from online. That would probably be close to your 2000. Try a "search".
1994 FIREBIRD FORMULA

FRED

Posted Image

381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor 0.78:1 O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

#10 bgonzalez95

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Posted 15 August 2011 - 11:20 PM

Hey everyone! My fans arent working and its causing an over heating problem! I checked the relay fuses by putting them into the fog light spot. Every time i did so the fog lights worked. They worked with fan #1 relay and with fan # 2 relay and faan #3 relay. Did i check the Relays properly or is there something else i should know?


hey did you ever find the problem?

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