79 928 AC Control Head

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24 Jun 2014 08:40 #17336 by gsc928
Hello All, I just purchased a, 79 928, from the original owner with, 33000 miles on the clock. It's never seen rain or snow. The AC control head needs to be replaced. Part # 92857306105. I haven't had any luck finding a replacement. I did find two electronic units here in Denver but there not compatible for my car. I've checked, Ebay, 928 International, 928r us, etc, but no luck. Does anyone know where I might be able to pick one up?
Thanks

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27 Jun 2014 09:11 #17342 by gsc928
Replied by gsc928 on topic 79 928 AC Control Head
Hello All, I just purchased a, 79 928, from the original owner with, 33000 miles on the clock. It's never seen rain or snow. The AC control head needs to be replaced. Part # 92857306105. I haven't had any luck finding a replacement. I did find two electronic units here in Denver but there not compatible for my car. I've checked, Ebay, 928 International, 928r us, etc, but no luck. Does anyone know where I might be able to pick one up?
Thanks

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27 Jun 2014 16:24 #17344 by 928mac
Replied by 928mac on topic 79 928 AC Control Head
I believe there is a repair that you can do yourself depending.
normally its just a small relay that blows that can be replaced with a radio shack relay.
The thread about it in on Rennlist.
lets see if anyone else chimes in

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30 Jun 2014 13:03 #17348 by 928mac
Replied by 928mac on topic 79 928 AC Control Head
Unless Tom at 928 intel or Roger at 928Rus can help, you may just have to wait for someone that is scraping an older model to speak up.
There was someone on the 928Owners Club facebook page that had some parts they were going to throw out.

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01 Jul 2014 20:10 #17353 by mm928
Replied by mm928 on topic 79 928 AC Control Head
Yes it depends on how dead it is. You can fix some external and small things. Check around Mr Google and see what pops up. But if you don't know and/or don't care to try it yourself, you can try some small electronic shops for someone willing to pull it apart and try to recondition it, or try to find a replacement. If you do find one,,, you might pay 100 for scrap or 800-1000.00 for something that is either new or guaranteed to work.

Hopefully you have a sunroof in the meantime.. :)

But indeed Roger or Tom are good places to start first.

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

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02 Jul 2014 16:00 #17357 by gsc928
Replied by gsc928 on topic 79 928 AC Control Head
Thanks for the responses. I've been told the control head is not repairable. I'm trying to find a replacement but no luck so far.

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05 Jul 2014 08:32 #17550 by jwillman
Replied by jwillman on topic 79 928 AC Control Head
What is the fault?

I have done a couple of repairs to mine for the electric trace board and replacing the AC compressor switch.

JIm

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07 Jul 2014 08:11 #17364 by wallyp
Replied by wallyp on topic 79 928 AC Control Head
"I've been told the control head is not repairable."

By whom? You may be putting too much faith is someone who doesn't know...

I would suggest that you actually tell us the symptoms, in great detail - someone here might have been down this road before.

Wally Plumley
928 Specialists
www.928gt.com

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11 Jul 2014 09:07 #17373 by gsc928
Replied by gsc928 on topic 79 928 AC Control Head
I was told by Roger Tyson from, 928 R Us that the Hvac unit could possibly be refurbished depending on what was wrong with it. The AC blows cold air out the vents and the fan speed works but the Hvac control levers do not work. I have a close friend who owns a service center and also is familiar with Porsche's. He pulled the unit and he told me that there is actually broken pieces (I'm assuming he means the control levers). Anyway, he couldn't fix it and re installed the unit. The fall out was, the AC compressor is not kicking in so he probably missed a connection. I have the 928 down at another company called Classic Restorations in Denver. The owner is also a close friend. His company does total restorations on blue chip cars. They do fantastic work. His AC Technician is going to take a shot at it. I have a copy of the shop manual on DVD which I gave them. By the way, they also did an off wheel detail on the car including refinishing the wheels. The car looks brand new. If you have any ideas please let me know. On a side note. I am a Zone manager for General Motors. I've been with GM for over 31 years. I also have a ZR-1 Corvette and a 87 Buick Grand National. I love cars and have always wanted a, 928.
Thanks

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14 Jul 2014 20:39 #17387 by gsc928
Replied by gsc928 on topic 79 928 AC Control Head
Well, I had an AC specialist look at the 928. He thinks the Hvac unit is okay. There isn't enough volts getting to the AC compressor to kick it in. I also found out that my Aux cooling fan is not working. I ordered another one and once we have that installed he should be able to get to the root cause and get my AC issue resolved. I also took the opportunity to replace the hood installation pad since the car is sitting. When I'm done with this thing it's going to be show condition. I'm still going to drive it though. Only on nice days of course.

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22 Jul 2014 19:45 #17404 by 928mac

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18 Aug 2014 18:14 #17479 by Rich928
Replied by Rich928 on topic 79 928 AC Control Head
What has failed with the AC controller? My '79 928 AC wasn't working correctly and we found
a) temp slider mount anchor broke ... no easy fix, so I disconnected it and adjust it by hand (lever down by the gas pedal).

b) vacuum tubes not mounted correctly. I located the correct placement and properly connected the tubes, everything works.

Drop me a note at This email address is being protected from spambots. You need JavaScript enabled to view it. and I can provide a bunch if information and some photos.

Rich
'93 928 GTS Cover girl
'87 928 S4 ... newly rebuilt AT!
'79 928 red 5-speed no sunroof rescue
'79 928 5-liter upgraded track machine

Rich
Membership Chairman
Charter Member
1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast

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