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Technical => Firebird & Trans am => Electrical => Topic started by: b_hill_86 on May 02, 2019, 07:48:36 PM

Title: A/C, blower connections under hood
Post by: b_hill_86 on May 02, 2019, 07:48:36 PM
Might be getting ahead of myself but my next project may be to put A/C back on my car. In the meantime my Hi setting for the blower has never worked. My A/C stuff under the hood is also gone so thatís left some wires disconnected.

Any help identifying would be appreciated. Specifically, Iím trying to get that Hi setting to work. What Iíve read says there is a wire from the alternator that feeds power but Iíve read it could be red and I thought somewhere it said it could be green. I have a green wire with no connector but itís not long enough to go to the alternator. And I have a red wire but the connector doesnít look consistent with attaching to the radiator. Nor is that one long enough.
Title: Re: A/C, blower connections under hood
Post by: Burd on May 02, 2019, 11:01:05 PM
Iím doing my harness Saturday.   Iíll post up whatís what.   78 may be diff I donít know. 

First pic looks like the idle solenoid
Last is the low pressure switch.
You may want to get a new harness. Thatís what I did.  A member sent me a mint Orig.
And I see a box from firedan came today.   Iím ready to do mine nice.  Thanks Dan, thanks tase.    8)
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on May 03, 2019, 12:07:24 AM
Iím thinking they are different but Iím not sure. Iíll take what info youíre willing to share
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 03, 2019, 04:27:00 AM
I'll get some pictures after work today for you but there is a jumper that goes from the red wire to the alternator.  It has a mating connector that plugs into the one you have and a connector on the other end that plugs into a wire with ring on the other end that goes on the back of the alternator.

Title: Re: A/C, blower connections under hood
Post by: smith79 on May 03, 2019, 04:28:37 AM
here is the schematic

Title: Re: A/C, blower connections under hood
Post by: smith79 on May 03, 2019, 05:13:38 AM
Here is a picture I found online of the jumper (labeled Pontiac 301/350/400 extension)

(http://www.firebirdtransamparts.com/techinfo/harness/optionwire/acpower.jpg)
Title: Re: A/C, blower connections under hood
Post by: Burd on May 03, 2019, 08:42:15 AM
You can swap out the bad wires with a donor harness.  I just swapped out the green wire w/ black stripe.  Using a very small screwdriver, you push it in the plug enough to release the tab on the crimped end, it slides rite out.   One side has a little tab.  Real easy to do.   I may have some parts you can use, the black ground was the prob on my OG harness.   Leme know it you need any wires. 
 Think you can buy the extension harness by itself.   Iíd replace the wires with the melted plugs on. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on May 03, 2019, 09:18:47 AM
Ok good that makes more sense then! Thanks!
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on May 03, 2019, 09:23:59 AM
My 77 diagram showed part of that wire being green which was throwing me off
Title: Re: A/C, blower connections under hood
Post by: Burd on May 03, 2019, 11:06:46 AM
1977 & 1978 harness are the same, they are routed a little diff thatís all.  I can prob help you on the bad wires. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on May 03, 2019, 01:13:47 PM
Thatíd be great
Title: Re: A/C, blower connections under hood
Post by: Burd on May 05, 2019, 09:48:55 AM
So I went to replace the AC harness yesterday, people say, take the glovebox out, itís rite there, BS.  It comes through the firewall behind the heat box.   You canít see anything.   Now 2 people say to run a string to try to pull in through everything  :-[
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 05, 2019, 07:31:18 PM
So I went to replace the AC harness yesterday, people say, take the glovebox out, itís rite there, BS.  It comes through the firewall behind the heat box.   You canít see anything.   Now 2 people say to run a string to try to pull in through everything  :-[

I just did this a couple weeks ago.  You pull the glove box and it is right there to the left behind the radio.  Very easy to get at once you find it.

Actually I still have the glovebox and that lower vent out and can go snap a picture of it for you if you need it.

Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on May 05, 2019, 08:01:28 PM
If he doesnít Iíd like to see it. Iím not sure I need to replace my harness necessarily but when time comes to add my AC stuff back it may come in handy.
Title: Re: A/C, blower connections under hood
Post by: Burd on May 05, 2019, 11:01:29 PM
I see the plug.    It comes in from behind the box.   Itís not easy like everyone says
You have to remove the lower duct as well. 

Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 05:03:27 AM
If he doesnít Iíd like to see it. Iím not sure I need to replace my harness necessarily but when time comes to add my AC stuff back it may come in handy.

Ok I'll get a pic.
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 05:04:26 AM
I see the plug.    It comes in from behind the box.   Itís not easy like everyone says
You have to remove the lower duct as well.


Yeah, now wonder it was a pain in the ass if you removed all that shit.  The A/C harness is easy.
Title: Re: A/C, blower connections under hood
Post by: tz6p06 on May 06, 2019, 07:37:56 AM
I see the plug.    It comes in from behind the box.   Itís not easy like everyone says
You have to remove the lower duct as well.

I'll come by this weekend and do it for you.  I replaced mine without the need to remove the ducts.  You need to stick your arm between the ducts, I know its hard to grab it but it can be done.    It is easier to attach a string before pulling the old one through.  I wasnt part of any forums when I first got my car and I was able to replace it.  I'll stop by Saturday so you can stop  :'( :'(
Title: Re: A/C, blower connections under hood
Post by: Burd on May 06, 2019, 08:46:12 AM
tase Said to do the string thing too.  Iíll try it.  Itís just not put the new one in. 
 Brian, pic was  just a joke itís not that bad.   But it still sucks. 
Title: Re: A/C, blower connections under hood
Post by: Burd on May 06, 2019, 09:29:32 AM
Quote-I'll stop by Saturday so you can stop 


I have Heat and AC.   :P
Title: Re: A/C, blower connections under hood
Post by: tz6p06 on May 06, 2019, 11:13:23 AM
Quote-I'll stop by Saturday so you can stop 


I have Heat and AC.   :P

You replaced the leaky heater core?
Title: Re: A/C, blower connections under hood
Post by: Burd on May 06, 2019, 03:20:07 PM
In my garage.   I have heat and AC.  But Iíll get the harness done.   
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 04:36:54 PM
Why are you having a hard time with this, is there something in the way on your car that is not there on the 79's?

Mine was right there easy as pie after I pulled glove box and vent which was also easy to do.  I'm having a hard time imaging what could be difficult about this.  I'll try to get out there and get pictures later.
Title: Re: A/C, blower connections under hood
Post by: Burd on May 06, 2019, 06:39:49 PM
The harness comes in behind the heat box, you canít see it.  See the wrapped black bundle.   Thatís it. 
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 06:49:40 PM
The harness comes in behind the heat box, you canít see it.   Pie my ass.

Did you pull it out of the firewall first?  You could see it clear as day when it is pulled out with the light coming through the hole.

F*cking pie man.  This is a cake job.

Title: Re: A/C, blower connections under hood
Post by: Burd on May 06, 2019, 07:05:25 PM
Ya ok. 
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 07:06:09 PM
There is the connector right there.  Unplug it and pull it through the firewall and stick the new one in.
This whole job took me maybe 10-15 minutes including pulling the glove box and vent.  I didn't use any strings or whatever the hell you guys are talking about.

(note - i removed whatever wires I didnt need since I deleted the A/C so I think in my picture it is missing a green wire and maybe 1 more I forget.)
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 07:12:32 PM
By the way, I modified the schematic I posted earlier in this thread.  If you want to delete your A/C and keep your heater blower motor working you can clean up your harness before you install it by removing unnecessary wires so it looks like this.  (I also deleted the idle stop solenoid because Phuc that thing, it isn't going to work with my carb anyhow.  You can keep it if you want but I deleted it from the schematic)

In case anyone is interested
Title: Re: A/C, blower connections under hood
Post by: smith79 on May 06, 2019, 07:20:38 PM
Just in case you are still having a hard time

Title: Re: A/C, blower connections under hood
Post by: Burd on July 08, 2019, 08:30:07 AM
B, I have my old harness in a box, I had to rob the extension red wire female plug, but thereís still a lot left to use if you need any.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 08, 2019, 01:57:14 PM
So far all I know Iím missing is the wire from alternator to to harness for the high fan and maybe a couple connectors on the wires I took pictures of. Not really sure otherwise yet.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 20, 2019, 09:53:08 PM
Iím gonna figure this out sooner than later. This week I plan on trying to sort through my harness, figure out what I have and donít, test what I do have if possible then Iím gonna pick up and install this kit I think.

https://originalair.com/77-78-12-firebird-exc-turbo-134a-engine-compartment-upgrade-kit-pressure-switch-stage-2
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 21, 2019, 09:36:42 AM
Alright I give, whatís the circled component below?
Title: Re: A/C, blower connections under hood
Post by: Burd on July 21, 2019, 10:43:20 AM
Ac muffler and thereís a bracket.  77? I think, late 78 and 79 doesnít have it. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 21, 2019, 10:45:15 AM
So probably wonít need it with the aftermarket kit Iím using Iíd think?
Title: Re: A/C, blower connections under hood
Post by: Burd on July 21, 2019, 11:23:48 AM
You can see the 79 system on Brettís car.
Prob not. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 21, 2019, 11:53:31 AM
O yea I see. No muffler on it. Ok cool that helps.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 22, 2019, 02:11:18 PM
 Well I finally had a chance to do some troubleshooting today. I was able to confirm that the salad green wire Iím holding in my first picture goes to the compressor for power, the two wires with connectors in my other picture go to the thermal switch,  then I have a light green with black stripe that I believe goes to the idle stop solenoid and then the connector with green wire and light green wire goes to my pressure switch.

 I ran a jumper wire from the battery to the red wire and confirmed that my high fan speed does in fact work still and I also tested voltage at the light green wire going into the pressure switch which has 12v when my cabin controls are set to an air setting.

Now I think I know enough works to pick up that kit. Should be pretty straight forward from here I would think.
Title: Re: A/C, blower connections under hood
Post by: Burd on July 22, 2019, 02:34:51 PM
I have a good red wire. But I had to pinch a female connector off it. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 22, 2019, 05:08:00 PM
Mine is good from the firewall to the first connector which looks slightly melted but usable I think. You donít have the extra piece that runs from there to the alternator though do you? Didnít you have to reuse that on yours?
Title: Re: A/C, blower connections under hood
Post by: Burd on July 22, 2019, 05:50:50 PM
I can pull the red wire for you, I did have to punch a female connector. Maybe yours is good. They come off easily.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 22, 2019, 06:31:59 PM
Send or post up a pic next time you have a chance.
Title: Re: A/C, blower connections under hood
Post by: Burd on July 22, 2019, 07:15:25 PM
I have the harness for under the dash if you need too. Itís plugged in the the main harness in my pic.  Itís perfect.   
Hereís the all I have.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 22, 2019, 08:02:59 PM
Hmm. I think I have all of that in tact minus two connectors. The one to the compressor and the one to the idle stop solenoid but I donít think Iím going to need either connector with this kit.

I was looking for the wire from alternator to the connector for the high fan speed. I think you said youíre keeping that though right?
Title: Re: A/C, blower connections under hood
Post by: Burd on July 22, 2019, 08:10:51 PM
Anything in the pic you can have. 
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 22, 2019, 09:36:41 PM
Alrighty Iíll see where I end up with everything. Appreciate it.
Title: Re: A/C, blower connections under hood
Post by: b_hill_86 on July 23, 2019, 01:42:34 PM
Another nice little surprise today. I hadnít realized these cars did the recirculate thing on MAX A/C till recently so I decided to check my car out. Now that I know my hvac controls are still sending power where they need to I tested the blend doors. All seemed to work fine except the recirculate door which I found did actually work but was stuck in the open (recirculate) position due to a missing spring. Luckily enough the spring had fallen down somehow and was still intact. Quick easy fix and it worked!

Also makes me happy cause in the past even on cooler days it gets warm in the cabin with the windows down so if tried the vent setting to blow some cooler outside air but it was ALWAYS warmer than outside. Made me think the hot/cold diverted probably just wasnít closing off the heater core all the way which I was not looking forward to fixing. Now I realize it was because it was recirculating he warm cabin air DUH.

Long story for no real reason but after the engine and trans troubles I had in the past these little victories (shit actually still working well after 42 years) count for something.

Now I just have to see if my evaporator core leaks or not and have it cleaned out if needed/possible before I order the A/C kit.
Title: Re: A/C, blower connections under hood
Post by: Burd on July 23, 2019, 07:58:31 PM
Yes.   Run alcohol thorough all the stuff your keeping.  Start all over with the oil and Freon.