86 Camaro 305. Computer delete. Single fan. I have a blue wire coming from coolant temp sensor on the right side of the engine that has been cut. Radiator cooling fan turns on when switched to A/C from inside car. Is there a place I can tap into with the blue wire so the fan activates when temp sensor closes? By the fan relay? I would like the fan to operate as it came from the factory instead of buying an add on. Or maybe direct me to where this has been discussed.
I will add that it is a 5 wire fan relay.

 

Fan switch wire is NOT blue. It's dk grn w/ wht stripe.

Blue is more likely either the knock sensor or electric choke. KS is in the block drain plug hole on the pass side of the block just above the oil pan; electric choke is on the side of the carb.

Find the dk grn w/ wht stripe wire and hook it to the fan sw in the pass side head, between the #6 & #8 spark plugs.

Fan relay only needs to be 4 terminals since it doesn't send power to anything when not operated (which is what the 5th terminal is for). Having the 5th terminal doesn't hurt anything except that the factory connector might not plug onto it right.

 

Guess I’ll have to back and trace that blue wire. I was sure it originated between 6 and 8.
I guess I’m confused about fan relay since there is 5 wires going into it. Green, Red/black stripe, Red from fusible link, and 2 brown w/white stripe. But now that I look closer it seems as the 2 brown wires go to 1 term.
I may get back with another question about this. Thanks for info.

 

Those are the right colors at the relay, except, the one wire isn't green, it's actually dk grn w/ wht stripe. The other end of that wire should go to the fan sw. The blue wire you have there is for either the KS or the choke; if whatever carb you have on there now has an electric choke, you could go ahead and hook it up there, if it's that blue wire. The 2 brn w/ wht stripe both go to the same relay terminal, so the relay has only 4 terminals.

 

Sofakingdom…thanks for clearing up a few questions I had. The wiring diagram makes more sense to me now.
The wiring diagram (for 86 5.0) shows a dark green wire coming off the temp sensor/fan switch (hope I’m not confusing them) which correlates to the dark green wire terminated at the fan relay. There is no white stripe…I even pulled some out of the wire loom to check. I will get under the later and check for the dark green wire connection between 6 and 8. Feel free to correct me if I’m wrong…👍

So if what I said above is true if my cooling fan should come on when the switch reaches the pre set temp. Otherwise I may have a bad sensor. I believe these car have a hot pre set…I guess I was worried when the temp started to climb.

 

You may well be.

The temp gauge sending unit (not a [mrspock]sen-sore[/mrspock]), in the driver's side head between #1 & #3 plugs, uses a dk grn wire with no stripe. This works the gauge ONLY and is not related to either the ECM or the fan. This color of wire has been used for this purpose in all GM cars since ... they introduced electric temp gauges. Some time in the early 1950s I think.

The fan switch, in the pass side head between #6 & #8 plugs (same hole as the above except of course the other head), uses a dk grn w/ wht stripe. This same wire terminates at the fan relay. Doesn't matter that your car is a [whatever]; this is all the standard GM color code, used in all cars. Whether you have seen the white stripe at the relay or not, that's what the wire is, or at least, was when it left the factory. Your car is the same as all the others in this regard unless Skillet has got himself in there with his dykes; a possibility that of course cannot be ignored.

The fan switch is just a switch. It's also not a sen-sore. It's like the thermostat on your living room wall that turns on your central air conditioner: it has a contact set that's disconnected when cold and connects when hot, thereby operating the relay via the dk grn w/ wht stripe wire. There's no real "intelligence" in the circuit at all. If you connect any wire other than the dk grn w/ wht stripe one to it, it will not operate the fan relay.

The fan switch is a Weatherpak type connector with a single contact. It looks like this https://www.autozone.com/engine-mana...c-switch-sw500. The connector looks like this https://www.autozone.com/engine-mana...onnector-85140except that the wire is dk grn w/ wht stripe. The temp gauge sending unit looks like this https://www.autozone.com/engine-mana...re-switch-tu66 if it's been replaced, otherwise if still original it has a sort of "mushroom" looking connector on it, and the connector slides onto it kinda sideways. This OE connector will also plug onto the more normal style of connector like the unit in the link. Its wire is dk grn w/ no stripe.

The original coolant temp sen-sore for the ECM was in the water outlet, immediately below the upper radiator hose. Its wires were yellow & black. With "computer delete" this may no longer be there, either the sen-sore or the wires.

Since you say your car is "computer delete", the quality and accuracy of whatever wiring is left in the car, is highly suspect. I recommend that instead of arguing about it, that you find the right wires and hook it up as I have repeatedly described, since that will remove whatever butchery (and I suspect there's PLENTY of it) that Skillet visited upon it in the process of hacking the computer out.