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Registered
Join Date: Mar 2011
Posts: 598
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Heater Backdate Question?
Hey guys,
I’ve got the left side heater backdate duct on my motor, but not the right hand side one because I need that space for my A/C compressor. Is the airflow from the left side backdate duct enough to push air through both heater exchanger inlet ports, so I can get enough heat into the cabin? I presume the blower motors inside the cabin will draw enough warm air into the cabin? Advice appreciated. Last edited by 911TT33; 11-14-2024 at 05:34 PM.. |
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11-14-2024, 05:30 PM
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Registered
Join Date: Dec 2002
Location: So Cal and So Oregon
Posts: 2,180
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I have the one duct only, without the blower motors, and it works fine. Sadly though, the car resides in SoCal and not much heat is needed...ever.
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11-15-2024, 08:10 AM
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Titanium User
Join Date: Aug 2014
Location: NY
Posts: 3,251
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You can buy a new right side heat duct from Porsche that clears the AC bracket/compressor. It comes in 3 pieces.
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11-15-2024, 08:53 AM
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Registered
Join Date: Mar 2004
Location: North Vancouver bc
Posts: 5,293
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my backdated unit gets plenty hot using one side - i rarely open the passenger side. being in motion is the key - i wouldn't want to commute in stop and go traffic, if it was truly cold out. ..... and? defrosting could become an issue, RHS. yes?
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11-15-2024, 04:00 PM
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Registered
Join Date: Aug 2022
Posts: 221
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Quote:
Agreed on this point. I have backdated mine and have both ducts on with AC, however I often just use the driver side lever and it is plenty! |
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11-15-2024, 04:27 PM
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Registered
Join Date: Mar 2011
Posts: 598
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Cool. Thanks for confirming guys.
I think I’ll connect up the engine duct to the right hand side heat exchanger so the driver gets all the heat. Oh, this is a RHD vehicle as I’m in Melbourne, Australia 👍🏼 Doesn’t get TOO cold here, and I don’t plan to drive the car much at all in Winter anyway. It’s just a “nice to have” in the event it’s a little chilly when out and about. Curious, is there a part number for the 3 piece right side duct that clears the A/C?! |
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11-15-2024, 04:33 PM
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Registered
Join Date: Aug 2022
Posts: 221
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Quote:
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11-15-2024, 05:01 PM
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Registered
Join Date: Mar 2011
Posts: 598
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Quote:
Now I just need a 2.5” to 3.0” aluminium transition for the 3.0” heater ducting to my right heat exchanger (993TT heat exchangers). |
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11-15-2024, 07:27 PM
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Registered
Join Date: Apr 2024
Location: South Carolina
Posts: 125
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check my post here, I modified the existing block off plate for about 20$ and it clears the AC bracket:
https://forums.pelicanparts.com/porsche-911-technical-forum/1169400-1983-sc-heat-backdate.html#post12356155
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'83 911SC - Rubinrot Metallic IG: @911.sc.83 |
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11-15-2024, 07:42 PM
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Titanium User
Join Date: Aug 2014
Location: NY
Posts: 3,251
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#5, 6 & 7 plus hardware
 http://www.auto atlanta.com/porsche-parts/hardparts.php?dir=911-78-83§ion=105-05
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11-16-2024, 05:19 AM
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