Sorry about all these wiring posts!! So close to starting my car.

1983 Firebird, was a V6 car.

This wire is coming out of the harness that plugs into my heater box.

Any idea what it goes to?

 

Looks like the temperature sender for the gauge , if the wire is dark green . (lower left of this diagram)

 

I don't think the wire for Temp sender would be coming from the heater box...

 

Yeah the temp sender wire comes out of the C100 (bulkhead) connector. But I do appreciate the guess!

 

3 possibikities

Fan switch pass rear head
Ac clutch
Ac on fan control (fan on with ac control on)

 

Hmm, definitely could be AC stuff, but my car didn't have that option, and the plug it shiny like it had been connected. I don't think there were any electric fan options in 83, were there?

 

Post a pic

 

Sure I can take any pics that'd help. What exactly? My first post shows the plug, and the harness. The harness comes out of the firewall behind the passenger head, and has the connections for the blower motor.

 

Oh pic didnt load on app for me. Its light green. I dont think v6s have an ac throttle kicker. Must be from a thermostatic vac valve or sensor. Does it go into the loom under the ac box that runs to the ecm. It goes through the pass side a pillar behind the kick panel

 

Connection for checking Carb dwell ?

 

A LT GRN wire that is part of the HVAC control goes to two places. The pressure cycling switch on the receiver/dryer and the idle stop solenoid. Wrong connector for the A/C pressure switch, but easily the correct connector for the idle stop solenoid.

If the wire reaches the carb that would be my guess.

RBob.

 

Thanks guys! Knew we'd get it figured out. I pulled the V6 thinking I labeled everything but... never the case.

So, with a non computer controlled motor that has an Eddy 1406 on top... how do I connect this wire? Or do I not need to? What does the Idle Stop Solenoid do?

Wish I could CTRL+F on my FSM! So hard to search for things in that big book.

 

Though it seems I'm reading the Idle Stop Solenoid is to idle up with the AC on, is that correct? I have a non-AC car, and this plug does appear to have been connected somewhere.

 

Idle stop solenoids can be used to close the throttle plates on a carb when shutting off so the engine doesn't diesel. You set the idle with it activated and have minimum set point with it without power.
Another thing it could do is raise idle speed with the A/C on also.

 

That is my understanding, that it ups the idle speed when the A/C is on. It being a non-A/C car it was likely not used. Since it looks like it had been connected, maybe it was but not to the correct location.

RBob.

 

RBob, that logic works for me. I'll revisit this when I finish the engine swap if something isn't working!

 

Ah HA! Maybe this pic will help!! This was the connection that the green wire USED to go to. Black plug that had three wires. This green wire coincided with a yellow on the other side of the plug. Black was ground. Blue had no mate on the other side of the plug.

 

HVAC wiring. Look at the diagram that OrangeBird posted, top center. The LT BLU wire goes to the P/S pressure cutout switch. Which then goes on to the A/C compressor clutch.

This causes the A/C compressor to shut off when P/S pressure is high, such as when parking at low speed. Prevents the engine from stalling due to the added engine load from the P/S pump.

RBob.

 

OK, so the LT BLU not having a connection on the other side of the black 3-wire plug makes sense then.

And the LT GRN has to be the IDLE STOP SOLENOID for the AC, also not needed.

Sounds like my heater controls will work OK after all.

Thank you guys for helping, OrangeBird that diagram was a big help!!

Now to figure out what those last two wires are... V6 to V8 wire question