coolant fan switch connector broken (6 & 8) - Cooling - Third Generation F-Body Message Boards

neagan · 05-16-2008, 05:22 PM

Yes, I did a lot of SEARCHing before posting!

Neither fan comes on. I went under the car to locate the coolant fan switch located between the #6 & 8 spark plugs. I found two. The one directly between the two plugs has no wire attatched and I found no 'green' colored wire in the area. There is a black one with no connector attatched; possibly it?
The second switch looks the same, with an cone shaped plug in. This one is a couple inches below the first switch. This one also has a black wire that is connected.

I tried to jump the first connector at that loose black wire but nothing happened. Do I need to have the ignition turned on to ACC? I found one of the fan relays right by the battery and the driver's side fan came on when I jumped it. Where is the 2nd relay located?? This is a duel fan 5.7 1988 IROC. Please bear with me, as I'm dislexic.

If the coolant fan switch should only have a green wire attatched, how do I trace back to locating the missing wire?

Help is greatly appreciated here as I've spent a couple hours with our SEARCH engine. Nitro-Nicky

RED86Z28 · 05-17-2008, 08:10 AM

Its not the lower wire. That one should be the knock sensor.

naf · 05-17-2008, 08:44 AM

Yeah, lower wire is for knock sensor. You can do a continuity check on the other wire back to the fan relay. This wire provides a ground to the control voltage for the relay. A new connector can be found thru TPI Parts, a sponsor here. May be other sources as well.

Ignition should be in Run, engine can be OFF. Some relays were mounted near the brake booster, not sure about your particular model.

neagan · 05-17-2008, 12:40 PM

Thanks guys, I REALLY appreciate it.

I went down to get it smogged on a 103* day and it was running to hot to complete the test. I've never had it go past 230* max temperature, so never noticed that the fans wern't kicking in-
Again, many-many thanks. Nitro-Nicky