Napster134

Hi all,

Recently, I've been having an overheating issue in stop/go traffic. The temps start to creep up slowly and eventually I'll end up in the red zone (on the stock temp guage)
I never have any issues when driving on the freeway. I suspect it's related to my fan setup:

1. I have the dual LS1 fans.
2. What I know at a high-level view:
   • 1st fan is triggered via my EBL ECM (or at least it's supposed to be)
   • 2nd fan is triggered via the head temp switch (or at least it's supposed to be)
   • I suspect one or both are not working when they should.
   • When I turn on my A/C, my driver side fan turns on, however, the "Fan" box in EBL WUD does not turn on.
3. What I don't know at a more detailed level:
   • One of my fans is connected to a relay that I wired a few years ago.
   • I have no clue how or why I wired it this way but I'm pretty sure I followed some sort of wiring diagram/tutorial
   • I believe this relay is triggered via my EBL ECM but haven't traced my wiring just yet to make sure.
4. Last night I found that the A/C switch would trigger one of the fans.
   • I took the car out for a drive and let it get to the middle of temp guage.
   • As soon as the middle was reached I turned on the A/C.
   • Temps began to decrease to normal.
   • This is why I suspect a fan malfunction.

Here are my questions:

1. Is there anyway to force enable the (supposed) EBL controlled fan by changing a parameter/value?
   • I wanted to try this to test the EBL controlled fan.
2. What would be the best way to test the non-EBL controlled fan?
   • I've already checked that my head temp fan switch is connected and in tact.
   • I was going to swap the connectors on each fan to test each via the A/C trigger but found I would need to get under the car and it was getting late.

scooter

iTrader: (11)

For the fan controlled by the switch, you can just ground that wire, since that is what the switch does.

Both fans should be wired through a relay though, so if they're not, you should add them

Ozz1967

iTrader: (4)

AC could engage both fans.

Have you run 12v power directly to both fans to make sure they work? I know you said one works so just the other would be needed I guess. This will eliminate the fan motor being an issue anyway.

Napster134

Hi all,

Ended up fixing this.

Each fan had it's own reason why it was not engaging:

1st fan (EBL controlled) was not tuning on because I wired the IGN to a dual fuse holder for my radio (http://a.co/bLOmzww) and had removed one of the fuses which I forgot to put back. Once I replaced the fuse then it started to work.

2nd fan (Head Fan temp. switch controlled) was not turning on simply because my fan switch was toast. I replaced it with the 87 regal one that turns on at about 212F.

Now they both work when they should

Thanks for all the replies everyone!

Ozz1967

iTrader: (4)

Good to hear you got it fixed!