Still sorting out issues on my new-to-me 87 GT. When I turn on the headlights the radiator fan comes on. Is this normal?
Thanks,
Daryl

Nope!

quote Originally posted by Daryl M: When I turn on the headlights the radiator fan comes on. Is this normal?

No, it's supposed to be the wipers.

You wouldn't believe the mess I found under the dash.

Ok, here is more info. I turn on the headlights and the radiator fan comes on. I turn the lights off the fan stops. I turn the lights on immediately and the fan does not come on. I don't get it. Any insights from anyone?

quote Originally posted by Daryl M: You wouldn't believe the mess I found under the dash.

That makes advice very problematic.

If it's primarily a stock car, I'd remove the dash (doesn't take long) and start tracing the wiring using a GM Factory Manual.
If it's a customized car, ergo the reason for the mess, a manual might not help as much and the process might be much longer...

[This message has been edited by David Hambleton (edited 10-23-2018).]

Where does one procure a 30 year old factory manual?

You may want to do a Google search for an online free 87 Fier o Factory Service Manual? If you have not already done so. Who knows you may get lucky and locate one.

Cajun, you are a lifesaver. I often overlook the obvious.

quote Originally posted by Daryl M: Where does one procure a 30 year old factory manual?

Fiero Store

https://www.fierostore.com/...rowse.aspx?d=281&p=1

[This message has been edited by David Hambleton (edited 10-24-2018).]

Thanks David.

quote Originally posted by Daryl M: Where does one procure a 30 year old factory manual?

https://cardiagn.com/1987-p...e-repair-manual-pdf/

Click this button to download that section of manual as a PDF




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3.4L Supercharged 87 GT and Super Duty 4 Indy #163

[This message has been edited by fierosound (edited 10-27-2018).]

Thanks

quote Originally posted by Daryl M: Still sorting out issues on my new-to-me 87 GT. When I turn on the headlights the radiator fan comes on. Is this normal? Thanks, Daryl

Turn off your AC completely, and then test if the fan starts. If the AC is on it will start the radiator fan. If the AC is off and the radiator fan comes on when the lights come on, could be wired wrongly if someone has messed with the electrical. Keep going on the manual.

quote Originally posted by ceoair: Turn off your AC completely, and then test if the fan starts. If the AC is on it will start the radiator fan. If the AC is off and the radiator fan comes on when the lights come on, could be wired wrongly if someone has messed with the electrical. Keep going on the manual.

I agree, check the wireing, especially at the fan relay. Might be wire chafing, a bare spot grounding on the body. So turn on the car and headlights and start jiggling wires, to see it the fan stops... you may need to buy a newer, (87\88 front end) wireing harness, if you can't find the source of the problem.

[This message has been edited by James Bond 007 (edited 11-18-2018).]

Here's a link to another forum member's download page that has the '87 service manual, plus the Chilton and Hayne's guides. The password is "freebee".

Manuals

Special thanks to member Intel for scanning these and making them available.