Author Topic: 1980 Trans Am AC relay problem ***FIXED****  (Read 5113 times)

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Offline ponchonutty

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1980 Trans Am AC relay problem ***FIXED****
« on: June 26, 2012, 05:09:12 PM »
I need to know what the black wire that goes to the relay that's attached to the AC/Heater box.  It is suppose to have ground but mine does not.  Anyone know where that goes or grounds at?
Thanks!
« Last Edit: June 27, 2012, 11:06:59 PM by ponchonutty »
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA

Offline eroc022

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Re: 1980 Trans Am AC relay problem
« Reply #1 on: June 26, 2012, 05:48:53 PM »
goes inside to the rest of the harness... or should
Eroc
Fixing the car that Restore A Muscle Car jacked up....

Offline jjr

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Re: 1980 Trans Am AC relay problem
« Reply #2 on: June 26, 2012, 09:06:21 PM »

 Sounds like the Cabin blower fan ground wire. The motor mounts on
the fiberglass and so doesn't have a chassis ground.

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline ponchonutty

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Re: 1980 Trans Am AC relay problem
« Reply #3 on: June 26, 2012, 09:21:36 PM »
OK.  well when I ground this wire my motor runs as it should....all three speeds.  This '80 is an untouched car.  It even has the original radio installed.  I have yet to find any harness cut.  I guess what I need to find out is where exactly this black wire grounds to.
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA

Offline jjr

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Re: 1980 Trans Am AC relay problem
« Reply #4 on: June 27, 2012, 11:54:07 AM »

 I don't have access to the HVAC section of the manual at the moment
(iPad in Doctors office) but there is a clip on the blower motor body,
that's one end of the wire and what allows flow through the motor.

 Later today, with my desktop, I can zero in on the place in the
HVAC section of the Pontiac written manual and show you.

 That section is awesome and very necessary, but I think we have
touched on the HVAC wiring a few times before. Try running a
search and see if you can find it already on here or on the other
popular sites. I'll check back later and add it here if not.

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline jjr

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Re: 1980 Trans Am AC relay problem
« Reply #5 on: June 27, 2012, 02:31:00 PM »

 Note the legend at the bottom... LU8 is the 301T and so the alternative
routing.



 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline ponchonutty

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Re: 1980 Trans Am AC relay problem
« Reply #6 on: June 27, 2012, 03:51:45 PM »
Great thanks.  This has me going in the right direction.  I wonder if it has anyting to do with my headlights too.  They all work but when on lowbeam the highbeam light up real dim.
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA

Offline ponchonutty

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #7 on: June 27, 2012, 11:09:19 PM »
Ended up getting it fixed.  That diagram helped me to trace things out.  Ended up the PO had unhooked that 2 pin connector that's between the compresser and that relay.  Also, found why my headlights looked odd on teh passenger side.  Ground wire was unhooked.  So, that being said everything besides the power locks work as they should :)
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA

Offline jjr

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #8 on: June 27, 2012, 11:51:26 PM »

 Happy to help in any way...

 With power door locks it's the actuators 99% of the time.

 Those units were very GM wide and are very often cheaper
bought for another model...

 I bought actuators for my 1985 El Camino only to notice they
were identical to my 1980 and 1981 cars... except for the price,
big savings in looking at the exchange.

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline joe d

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #9 on: June 28, 2012, 06:23:00 AM »
glad to hear it is fixed, amazing how some people do not see the importance of ground wires
1979 ws6 trans am (current project)
2005 mercedes s55
2001 dodge durango
1980 SE trans am (new current project)
1971 Monte Carlo
the 5 p's "perfect planning prevents poor performance"

Offline ponchonutty

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #10 on: June 28, 2012, 10:31:17 AM »
Yup.  Thanks again.  Hey, I do a lot of aftermarket stuff for car dealerships.  Would I ruin the value if I swapped out the power locks that are in there with aftermarket ones?  I would use the same switch and linkage.  Only might have to make one or two new mounting screw holes?  I use SPAL and their lock motors are hard to beat.  Plus new, the only run me about $18 a piece.
Here's their link for a complete kit however I'd just use the motors since everything else is there.  I'd like to also add keyless entry but that might take the value too far???
http://www.spalusa.com/store/main.aspx?p=itemdetail&item=37000148
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA

Offline jjr

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #11 on: June 28, 2012, 11:25:33 AM »

 Since the actuators are hidden no-one would know. Me, personally, I like
'em the way they came.

 You may have to change the wiring depending on how the aftermarket
units work.

 In some the electric motor always turns in one direction and use other
methods to change actuator direction.

 GM is fond of changing motor direction to achieve actuator reversal.

 So, we'd really need to verify how the GM units work and compare to
how the proposed replacements work.

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline jjr

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #12 on: June 28, 2012, 11:31:38 AM »



 Still wanna go aftermarket?

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com

Offline ponchonutty

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Re: 1980 Trans Am AC relay problem ***FIXED****
« Reply #13 on: June 28, 2012, 09:10:41 PM »
Thanks once again! According to this diagram these locks are reverse polarity.  The Spal system is the same exact thing so they'd hook right up.  I will do some wire tracing and wont be swapping out actuators until I verify they are indeed bad.
Rich enough to own a TA, too poor to keep'm all ;)
1980 TA (1st car)
1989 Formula
1976 400 4sp
1976 400 auto
1978 WS6/W72 4sp
1970 455 4sp Formula clone
1980 Indy Pace TA