Its a 91, 3.1 Camaro, 5spd

Ok, im still in this mess here, when I turn
my AC on the fan will not come on, it won't come on if I wait for the 200 temp mark either. If I jump the relay the fan motor kicks in. My gauge lights are also not working, I replaced the headlight switch already and they will not come on. Could someone please tell me how I go about in finding this problem? Im trying everything and just frustrated, thanks.

 

I cant relate to your fan - but if your gauge lights are'nt working you need to check your instrument panel fuse to see if it needs replacing.

 

First thing I think of when my dash lights go out.

Dash lights go out when your tail lights or brake lights go out.
Its a simple pre dummy, dummy light to get you looking around for a problem.

Matt

 

Heheh, I hate it when that happens

-Dan

 

Fuse is good, all other lights are working. Whats going on if I can jump my relay and the fan comes on. The plug is obviously getting power and it is a brand new relay.....As far as the gauge lights, which wires do I check to trace them, perhaps one got snagged or such. Thanks.

 

Gauges... did you check the inst fuse (5amp)? The HVAC control lights, auto shifter light and radio lights are all on the same circuit with the gauge lighting. If it's a fuse, they will all be out as well.
Fan... what wires are you jumping ? The power from the battery direct to the fan wire ?
You need to test for power at the relay. I'll guess it's a tan/wht wire for the switched power since I don't have a v6 diagram. You need to see if this wire is getting +12v with the ignition switched on. If not, check the c/hfan fuse (20a).
If it (the relay) is getting power, you need to check to see if the ground circuit is still good.
With the key on (engine not running), unplug the fan switch and ground it, does the fan run ?
With the key on, jump the A-B terminal on the ALDL port. The ECM should ground the fan relay when it goes into diagnostic mode. Does the fan run ?
With the engine running, unplug the switch on the hard a/c line the runs the frame rail back towards to blower box (dk blue and a black wire). When it's unplugged, does the fan run ?
That's all the items I can think of that will cause the fan to run. Keep in mind, the ECM switches the fan at roughly 220° and the fan switch operates at roughly 235° (unless changed for a lower temp. switch). Also, this is based on TPI wiring for the primary fan which, should be roughly the same for a v6 single fan. Don't quote me on that though

 

I am jumping the connector that plugs into the relay. As far as fuses go, all fuses are working. Where is the ground circuit? I bet that is probably what it is, how does one trace the problem if the ground circuit is malfunctioning? I don't know where that wire would get its ground or which one it is. With the ALDL in diagnostic mode the fan will not run, it does not run when the A/C is switched on either. Does anyone know the color of the gauge lights wires?

 

gauge light wiring is grey.

fan..

 

Damn; that's much better then my drawings!

You're saying the fan doesn't come on when you turn the a/c on? Why would it? As far as I've understood about the a/c system, the fan would only come on if there was excessively high pressure in the a/c system.

 

Cooling fan has always turned on when I had my AC on.

 

The fan pressure switch (which I mislabeled a/c pressure) should open when the line pressure exceeds something like 220psi. This makes the ECM see the A/C is on and needs to ground the fan relay (via the fan request or, pressure input I guess). By unplugging the switch with the engine running, the fan will turn on. It will not turn on if the engine is not running though.
This switch is also the reason why an elec fan. will run when the engine is started after one removes the entire a/c system (for one reason or another). When the switch is removed, the blue wire has to be grounded otherwise, the ECM will 'think' that the a/c is always on because of the open circuit.

 

I found that bit out when I removed my a/c back in '96.

But I don't ever remember my fan coming on when my a/c was on. Could Pasky (and others) just have high pressure in their a/c systems?

Or did GM change things after '86?

 

Alrighty, im about to test these listed wires in a bit, you wouldn't happen to know the general area the gauge light wires are would you? I have so many hanging wires under my dash its hard to look for anything thanks to the previous owner, thanks.

 

One gauge light wire that's easy to get to is the light-up indicator for the shifter plate. Another one that's easy to get to is the bulb that hangs from your dash right above the climate controls.

 

Ok, I have been playing with this on the freetime I had and I have seem to have found something strange. The green wire you indicate that I need to jump top the GND is actually the one carrying the 12V and the light tan /w white stripe doesn't have any at all. Everytime I try to jump the green wire to the ground my fuse blows. Whats going on?

 

want to get this done this weekend

 

Which fuse is blowing ?
I can only think of 2 reasons for the wiring, a) someone has jacked it around or b) it's wired reverse from the factory.
My 91 (v8) has a green wire for the relay ground, I can't see why a v6 would be wired opposite but, I'm sure it can happen.
Has the harness in your car or under the hood been hacked at any point in time?

Try grounding the tan/white wire and see what happens.

TomP.. I can't answer you about the a/c.. I'm only familiar with the wiring to that. One guess I would have though is that your pressure switch is/was bad (wouldn't open with a/c line pressure).

 

I'll give that a shot then. The fan fuse is the one blowing.

 

Alright, after grounding the White tan wire instead I get the click and the fan clicks on just like it says. Now where do I start for checking the bad grounds. BTW, thanks for all the help dead bird.

 

Anyone know all the ground points on these cars?

 

best way to check should be a test light.

 

Forgive me for being stupid , but test what? How and where? Just follow the wires? I have no idea how to test if a ground is bad.

 

Looks like you need to just eace the wire all overthe place and look for a melted on. Sounds lik a hot wire somewhere else has melted into the ground, when it got hot. Could be quick and easy or a big PITA.

Matt