88 Firebird 350 Issue
#1
88 Firebird 350 Issue
Was hoping to get a little help on a fan issue. I've gone through the basics I think and read 100 posts about it. Found a great troubleshooting guide someone posted but unfortunately it ended right before Chart 12-C, which was the one I needed. Anyway...
Changed the relays
manually put power to fans. They work
Checked under dash 20A fuse. Good
Wires all look intact.
Did diagnostic terminal ground test. No fan
Grounded the fan switch. Clicking relay, no fan
Tried turning on AC. No fan
The only thing that doesn't vibe with the schematic on the GM maintenance book that was posted is the orange wire that is supposed to go to the battery with a fusible link. There is no wire that goes from the relays to the battery.
The wires that go to the relays come from the firewall area on the passenger side and go into a cluster behind the engine.
There is one unidentified power wire at the battery but it goes toward the firewall on the drivers side and there isn't a fuse on that either. it's in the same cluster as the washer motor.
would the battery/fusible link wire normally go through the firewall and back to the battery? I just assumed it was more direct.
Thanks for any help.
Changed the relays
manually put power to fans. They work
Checked under dash 20A fuse. Good
Wires all look intact.
Did diagnostic terminal ground test. No fan
Grounded the fan switch. Clicking relay, no fan
Tried turning on AC. No fan
The only thing that doesn't vibe with the schematic on the GM maintenance book that was posted is the orange wire that is supposed to go to the battery with a fusible link. There is no wire that goes from the relays to the battery.
The wires that go to the relays come from the firewall area on the passenger side and go into a cluster behind the engine.
There is one unidentified power wire at the battery but it goes toward the firewall on the drivers side and there isn't a fuse on that either. it's in the same cluster as the washer motor.
would the battery/fusible link wire normally go through the firewall and back to the battery? I just assumed it was more direct.
Thanks for any help.
#2
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 88 Firebird 350 Issue
Where are your fan relays? pass side core support by the rad and inner fender structure?
#4
Re: 88 Firebird 350 Issue
a couple of pics that might help. Shows area around relays, where the wires leading to the relays come from and the ridiculous mess the PO made of the battery terminal. The wire with the yellow butt joint is the only one I don't know what does
Relays
Connector that joins relays, fans and wires from firewall.
Where wires originate from
Ugly battery terminal
Relays
Connector that joins relays, fans and wires from firewall.
Where wires originate from
Ugly battery terminal
#5
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 88 Firebird 350 Issue
The blower motor on the firewall is not part of the cooling system fans.
#6
#7
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 88 Firebird 350 Issue
Cool, what was the issue?
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#8
Re: 88 Firebird 350 Issue
Turns out the mystery wire in the pics was the power wire for fans. It had turned black but when I started pulling it was actually orange. It wasn't powering the fans though so I started messing with it and the crappy splice job done at the + battery terminal was all corroded. replaced it with a pigtail from Oreilly's and voila! Power. Now just have to figure out why the drivers side fan won't turn off. Oh well, at least it won't overheat.
#9
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Join Date: Oct 2001
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 88 Firebird 350 Issue
that's normally a stuck "on" relay
#10
Re: 88 Firebird 350 Issue
I replaced the relays as part of the troubleshooting but it's a possibility. I'm also dealing with a hypertech chip that may have changed the temp settings. I'm looking into DIY PROM gear to check that out.
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