Anyone rebuild AC control units?
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From: Nashua, NH
Anyone rebuild AC control units?
After a full day of testing and generally fooling around Jim and Roger and I have come to the conclusion that my AC "head" or controll unit is fubarred (Yes, I've replaced the relay). It will turn on the compressor on recirculate and defrost, but not in any of the other three positions.
It's such a simple piece of electronics that someone must be able to fix it. Rich, John, you out there?
Here's a picture of the circuit board. One of the components has a crack in it that you can see in the picture.
It's such a simple piece of electronics that someone must be able to fix it. Rich, John, you out there?
Here's a picture of the circuit board. One of the components has a crack in it that you can see in the picture.
Last edited by ErnestSw; Feb 16, 2006 at 07:59 PM.
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The new A/C control units are now over $1,000 if purchased from Porsche so I certainly understand the motivation to repair them. We were happy to find a source to rebuild them and have them available for a third the cost of new. We sell them exchange but more and more of the cores sent back to us have failures which are not repairable or have been modified in a way that they no longer function correctly. So at some point we may run out of repairable cores but at least they are still available new.
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From: Southern Alberta, Canada
Ernest........the component with the 'crack' in it is a diode and can be easilly replaced but of more concern is the overall condition of the solder joints...........perhaps have someone with good skills retouch the solder joints. May save a bunch of $$$!
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Ernest.. got a soldering iron? know how to use it? - its pretty easy...
You can get parts at radio shack or internet....
If you really need help - you can mail it to me and I'll do it for you.
Alan
You can get parts at radio shack or internet....
If you really need help - you can mail it to me and I'll do it for you.
Alan
Last edited by Alan; Feb 16, 2006 at 10:10 PM.
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Ernie,
Figure out where that connector (the one next to the cracked diode) goes on the wiring diagram.
It may tell you something.
Aparantly the 91 and above uses a different head unit - for once you were right.
Figure out where that connector (the one next to the cracked diode) goes on the wiring diagram.
It may tell you something.
Aparantly the 91 and above uses a different head unit - for once you were right.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
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Remove the diode, the 1N is the prefix to a number on the other side. As Alan mentioned you can get a replacement at RadioShack etc ... some new solder on those joints would not go amiss either.
Chris
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Eerest,
Not if you can solder it in less than 30 seconds! In fact its pretty difficult to damage a diode with soldering iron heat...
Do I take it that its still not working?
Can you test the other diodes? if you have a multi-meter with a diode/continuity tester you shoiul dbe able to... you may need to tracce out the circuit and see if there are any switches etc that have any effects to note.... with multimeter common (-ve) terminal to the end with the silver/white ring you should see conduction - you should not the other way around.
Alan
Not if you can solder it in less than 30 seconds! In fact its pretty difficult to damage a diode with soldering iron heat...
Do I take it that its still not working?
Can you test the other diodes? if you have a multi-meter with a diode/continuity tester you shoiul dbe able to... you may need to tracce out the circuit and see if there are any switches etc that have any effects to note.... with multimeter common (-ve) terminal to the end with the silver/white ring you should see conduction - you should not the other way around.
Alan
