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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,493
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3.2 Footwell Blower + Heater Backdate = Failure!!!
For those who have been following my tech article Tech Article on getting the footwell blowers to work without the engine blower, I have an update. Apparently the ballast resistor can't handle constant use. The ceramic resistor becomes brittle and vibration from driving eventually breaks it apart. Oh well, I guess I will next try the rewiring of the automatic heat console.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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11-10-2004, 05:18 PM
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Join Date: Sep 2001
Location: Kerrville, Texas
Posts: 1,021
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Great. Just when I think I'm ready. Sorry to hear it didn't work. It sure sounded good. Thanks for the update.
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11-10-2004, 05:25 PM
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Join Date: Jan 2003
Location: IL
Posts: 1,638
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Just saw your post on the ballast resitor... mine hasn't blown yet.
this guy houses it in a box and it looks to be isolated from vibration... http://www.porsche964.co.uk/technical/noheater.htm there's also other resistor options that are much more rugged. how about this bad boy... http://www.action-electronics.com/resist50.htm
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11-10-2004, 06:33 PM
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Join Date: Feb 2004
Location: Long Island, N.Y.
Posts: 1,798
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It's like driving around with a toaster in your engine bay.
j.p. |
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11-10-2004, 07:00 PM
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Document rewiring the auto heater control
All the backdaters (and auto-heat control haters) could use the detail on that!
Thanks, Chris |
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11-10-2004, 07:05 PM
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Join Date: Dec 1999
Location: Los Angeles
Posts: 2,479
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Okay, well, I got my footwell blowers to work without the engine blower on my 3.2.
In fact, the switch on my car for the headlight washers is now the "full-on-gimme-heat-til-I-die" switch now. Kicks them in, and they work great. I just disconnected the two wires for the washers and and hooked up a couple of extensions that run from between the seats under the carpet and behind everything up to that switch below the speedo.
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-kb- |
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11-10-2004, 07:19 PM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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Kurt,
Sorry to see it give up the ghost! Keep us filled in on the next move! JoeA
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11-10-2004, 08:23 PM
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Join Date: Oct 2002
Location: St. Louis region
Posts: 3,147
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Hey Kurt - some of the better quality resistors have the element embeded in epoxy, so they're a lot more durable. I think you just had a cheap resistor. One of the links above might lead to somthing like that, haven't had time to look.
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11-11-2004, 04:45 AM
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Any chance the updated 993 a/c fan and oil cooler ballast resistors would work? They look a lot more robust and are coated in epoxy. I don't have a photo of one, but there should be some on www.p-car.com. They are known weak spots in 993's and I think they've been improved upon.
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11-11-2004, 04:54 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,493
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Thanks for the pointers. I will order one of the aluminum house resistors and see what happens! Updates and pictures to come.
Just ordered one of these (50watt, 50 ohm resistor): 
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Kurt V No more Porsches, but a revolving number of motorcycles. Last edited by Rot 911; 11-11-2004 at 05:12 AM.. |
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11-11-2004, 05:03 AM
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Join Date: Jan 2003
Location: IL
Posts: 1,638
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Kurt... keep us posted. I'm going to order one of those things anyway. I'd also like to find a better location for it.
Note the bottom pic in this thread... can you see the ballast resistor sitting back there?  That ain't a pretty location.My $25 heater backdate for 3.2 w/pics
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11-11-2004, 06:36 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,493
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Quote:
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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11-11-2004, 06:45 AM
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Couldn't you just hook up a relay to the fan wire to make the footwell blowers run. I don't think using all that electricity to complete the circuit will help the battery and charging system. There has to be a better way.
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11-11-2004, 07:18 AM
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911 3.8 "RS"
993 Cab
Only Porsche
Only bike
