Cooling fan inoperative

[Tom87GNX]

Hey fellas I have no cooling fan operation, I have constant 12v from starter solenoid at relay connectors, and jumping the power to the fan proves the fan works. I don't have power at the brown wire on the relay connectors which is 12v ignition on which should be powered from either A/C fuse on 86 models or relay fuse on 87's. Has anyone run into this issue? The a/c fuse is good (I don't have a relay fuse or slot in fuse block) is there a connection somewhere else or factory splice pack? Any help would be greatly appreciated. Btw, I'm following the schematic from vortex buicks. Thanks in advance
Tom


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[bpman1234]

How about the temperature switch on the intake?

 

[Tom87GNX]

From what I understand that only controls the high speed fan, besides that doesn't control the 12v ignition on that I'm missing at the relay connector


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[Turbotre]

Has it worked up until now?
Is the dash wiring harness the same year as the engine wiring harness?

 

[Tom87GNX]

No, it's a freshly completed IC swap. The dash harness is an 85, and not sure if engine harness is 86 or 87. I got them working temporarily by running a separate 12v ign on feed to the relay, by doing this the fan runs as it should.


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[Tom87GNX]

So far it's the only gremlin I see, the car runs pretty well for just a quick base tune. Hasn't left the bay yet though, still have little details to complete that are not to my liking.


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[Turbotre]

The 85 didn't have an electric fan,so the wiring to the fusebox is different.It will have to be spliced to something else.

 

[Tom87GNX]

I'm aware of that, but was under the impression the 85 dash harness was the same as the 86 in which power from the A/C fuse would control the 12v ign feed like the 86 model did. The 87 model had a "relay" slot in the fuse box for the 12v ign feed to the fan relays.


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[Tom87GNX]

Nonetheless I have it wired in through a 12v ign feed now and the fan kicks on at 166 and back off at 162 as it should. Thanks for the info though.
Tom


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