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Registered
Join Date: Jul 2004
Location: Seattle
Posts: 181
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Heater backdate and AC on an SC?
I've looked at previous posts on backdating the heater, and everyone seems to ditch their ac. Is it possible to do the heater backdate and retain the ac on an sc?
Also, my car has the automatic temperature control for the heat. Will that complicate the backdate, or is it just the ductwork I'm changing? Thanks! Tom
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1978 911sc Targa (Sold  )2005 BMW X5 3.0i 2000 BMW 528iT (5 spd, sport) 2000 BMW 323Ci conv. (4 sale) 1987 Corvette Callaway Twin-Turbo Conv |
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04-28-2005, 09:40 AM
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Who is John Galt?
Join Date: Jun 2003
Location: Knoxville, TN
Posts: 638
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I run my automatic heater without the engine compartment fan connected, and it works fine.
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'79 911sc Targa '02 slk230 kompressor '84 Tamiya Falcon A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship. The average age of the world's greatest civilizations has been 200 years. |
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04-28-2005, 10:05 AM
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Go Speedracer, go!
Join Date: Aug 2002
Location: Indianapolis
Posts: 1,951
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I have automatic heat with backdated heating. It does not interfere with the auto heat.
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1981 SC ROW Coupe |
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04-28-2005, 10:23 AM
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Registered
Join Date: Dec 2004
Location: Novato, CA
Posts: 3,064
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You're in Seattle? Shouldn't you be ditching the AC and keeping the stock heat then?
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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04-28-2005, 03:29 PM
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Senior Member
Join Date: Mar 2000
Location: Lacey, WA. USA
Posts: 25,311
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I'm in Seattle. In the summer I take shorts to work and change in my office before heading home. it's a good life.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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04-28-2005, 03:46 PM
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Location: Seattle
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Ah, but for those trips to Western WA "wine country"! I know, it's a Targa, too. I may end up pulling out the ac, but for some reason I feel like I'm losing something - versus all the other backdates where you gain things like HP, etc.
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1978 911sc Targa (Sold )2005 BMW X5 3.0i 2000 BMW 528iT (5 spd, sport) 2000 BMW 323Ci conv. (4 sale) 1987 Corvette Callaway Twin-Turbo Conv |
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04-28-2005, 03:56 PM
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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,823
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I have a 83SC with backdated heat and kept the AC and no problems.My situation I only really need heat maybe 2 weeks out of the year and the AC about 40 weeks!!
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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04-28-2005, 03:57 PM
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Registered
Join Date: Dec 2004
Location: Novato, CA
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Backdating the heat doesn't really gain you anything either, except heat that doesn't work as well...
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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04-28-2005, 04:19 PM
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Registered
Join Date: Jul 2004
Location: Seattle
Posts: 181
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I was looking for a little less engine compartment mess and an easier SSI installation. It doesn't get all that cold or hot here in Seattle; so, marginal heat and marginal ac (stock) do ok.
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1978 911sc Targa (Sold )2005 BMW X5 3.0i 2000 BMW 528iT (5 spd, sport) 2000 BMW 323Ci conv. (4 sale) 1987 Corvette Callaway Twin-Turbo Conv |
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04-28-2005, 04:32 PM
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Registered
Join Date: Dec 2004
Location: Novato, CA
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If you backdate, the heat will probably work almost as well when you're cruising, but it doesn't work worth crap at idle. If you spend some time in Seattle (like I definitely do in CA) sitting in traffic jams in the rain, you'll wish you had kept the fan...
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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04-28-2005, 04:41 PM
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Registered
Join Date: Mar 2004
Location: New Jersey
Posts: 1,861
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The key to backdating the heat is to install footwell blowers and all the wye connectors for the duct work. I this was my winter project and it works very well. The wye connector allow you to use the side dash vents to blow some hot air on the door glass and vent windows. One of the nice things about the install is that I can now warm up the interior while the car is idling.
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Peace, Ron www.ronorlando.net 78SC Targa 3.2 SS, 964 cams, CIS, SSI's,Dansk Own a gun and you can rob a bank , own a bank and you can rob the world. |
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04-29-2005, 08:04 AM
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Quote:
Is there a "write-up" on this somewhere? A search gets me more "hits" than info. Particularly interested in footwell blowers and "wye" connectors information and installation "how-to". Thanks, Jerry M '78 SC |
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04-29-2005, 08:16 AM
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Registered
Join Date: Mar 2004
Location: New Jersey
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Jerry..Search on mysterytrain or footwell blowers. Unfortunately, I don't think I got to post much on the install. On my 78 targa, behind the footwell carpet there was an opening that allowed the alum/paper duct to snake up into the trunk area. My advice is to buy some duct work before you start the project because a soon as you touch that 30 yr old stuff it is going to come apart. Anyway, the cavity is deep but the opening was a bit tight and I wanted the blowers to be set into the cavity as far as possible to I could keep the stock carpet and look. The carrera's had a big old removal carpeted panel. ok, I found the links for you.
electrical question (footwell blowers) Footwell blowers in a 78SC
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Peace, Ron www.ronorlando.net 78SC Targa 3.2 SS, 964 cams, CIS, SSI's,Dansk Own a gun and you can rob a bank , own a bank and you can rob the world. |
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04-29-2005, 08:48 AM
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Not as it seems
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Quote:
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78SC PRC Spec911 (sold 12/15) https://www.youtube.com/watch?v=f7I6HCCKrVQ Now gone: 03 996TT/75 slicklid 3.oL carb'd hotrod 15 Rubicon JK/07.5 LMM Duramax 4x/86 Ski Nautique Correct Craft |
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04-29-2005, 08:53 AM
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Not as it seems
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Quote:
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78SC PRC Spec911 (sold 12/15) https://www.youtube.com/watch?v=f7I6HCCKrVQ Now gone: 03 996TT/75 slicklid 3.oL carb'd hotrod 15 Rubicon JK/07.5 LMM Duramax 4x/86 Ski Nautique Correct Craft |
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04-29-2005, 08:55 AM
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Senior Member
Join Date: Mar 2000
Location: Lacey, WA. USA
Posts: 25,311
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Quote:
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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04-29-2005, 09:02 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Shouldn't you be wearing tights?
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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04-29-2005, 09:40 AM
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Registered
Join Date: Dec 2004
Location: Novato, CA
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Quote:
 ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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04-29-2005, 10:31 AM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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Re: Heater backdate and AC on an SC?
Quote:
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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04-29-2005, 12:10 PM
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Registered
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Quote:
Jerry M '78 SC |
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04-29-2005, 06:18 PM
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1978 Porsche 911 SC 3.0
the 23 car
domino
